Corundum Brick Manufacturer – RS Refractory Brick Manufacturer

Corundum bricks are refractory products with corundum as the main crystal phase, and the alumina content is greater than 90%. High normal temperature compressive strength (up to 340MPa). High load softening onset temperature (greater than 1700°C). Good chemical stability has strong resistance to acidic or alkaline slag, metal, and glass liquid. RS Refractory Brick Manufacturer and seller is a powerful manufacturer and seller of refractory materials. Our refractory products have been sold to more than 100 countries around the world. If you need to buy high-quality corundum bricks, please contact us.

RS Corundum Bricks for Sale

High-purity corundum bricks. Corundum bricks are widely used in high-temperature heating furnaces, hot blast furnaces in the metallurgical industry, secondary furnaces in the petrochemical industry, gasification furnaces, gas generating furnaces, cracking furnaces, ceramics, building materials, scientific research, and other industries. Corundum bricks in various kilns are not only limited by various process conditions but also corroded and damaged by high temperature, high pressure, slag, and strong reducing gas. This chemical erosion and structural damage to corundum bricks reduces the service life of corundum bricks.

RS High-Purity Corundum Bricks Manufacturer

In order to understand the quality changes of high-purity corundum bricks, the test results of the normal temperature compressive strength of products in the past ten years were collected. Results: 73~80MPa accounted for 18.6%, 81~90MPa accounted for 14.0%, 91~10MPa accounted for 23.0%, and >100MPa accounted for 44.4%. The thermal shock resistance of the product has also been improved. Under good experimental conditions, it can reach 18 times and water-cooled to 1100°C.

In order to extend the service life of the furnace lining, new anti-flaking corundum products have recently been developed for fertilizer gasifiers and carbon black reactors. Product physical and chemical properties: Al2O3 99.51%, SiO2 0.15%, Fe2O3 0.11%, Na2O 0.026%. The apparent porosity is 18%, the bulk density is 3.20gcm-3, and the normal temperature compressive strength is 133.5MPa. Refire line change rate (1600℃, 3h) 0~0.1%, thermal shock resistance 1100℃ water cooling, 23 times.

Sintered Corundum Brick for Refining Furnaces from RS

Combined with sintered corundum bricks. Combined sintered corundum bricks use sintered corundum as granular material and mix it with corundum fine powder to make mud. The products formed, dried, and fired are called sintered corundum products, also known as corundum clinker refractory materials. The technical key points: In high-purity, sintered corundum products, the granules and fine powder should be pure corundum clinker with the same composition. In order to improve the thermal shock resistance and slag resistance of ordinary sintered corundum products, the second component is generally allowed to be added in an amount of less than 10%. Therefore, the Al2O3 content is still above 90%, which is within the low range of corundum refractory materials. The third ingredient is mainly mullite. The adding methods include forming mullite clinker and also adding silicon, clay, kaolin, kyanite, silicon micro-concentrate, etc. This causes mullite to form in the matrix during the firing process. In addition, the component of mullite can also participate in the form of particles, and other additives are fine powders less than 60 microns.

H3PO4 is selected as the binding agent, and its dosage depends on the performance of the product, fluctuating between 1% and 6%. In order to improve the performance of molded products, an appropriate amount of organic binder needs to be added. The amount of fine powder involved has a significant impact on the density and strength of the product. The fine powder is increased from 15% to 45%, and the density and strength of the product are greatly improved. If about 5% ultrafine powder, less than 1 μm Al2O3, is added to the fine powder, it will be of great significance to improve product performance.

RS Fused Corundum Brick

Fused corundum brick. When selecting electrofused brown corundum or white corundum, the electrofused block needs to be crushed to remove the ferrosilicon alloy or other impurities contained in the brown corundum block. The white corundum block should be free of flaky crystalline sodium peraluminate and other low-melting substances. Due to their low density, these impurity minerals generally float on the surface of corundum frit and are easily identified.

Fused Corundum Bricks for Glass Furnace from RS Factory

Combine the ingredients of fused corundum bricks and mix them into shape. When mixing the material particles used in fused corundum bricks, multi-level proportions should be selected according to close-packing standards to reduce intermediate particles and increase the amount of fine powder, which is beneficial to improving product density and sintering. Add a certain amount of adhesive mainly including aluminum phosphate, phosphoric acid, aluminum chromium, cellulose, pulp waste liquid, and other mud, and mix it evenly. The moisture content is about 3%-4% and requires high-pressure molding to obtain fine bricks.

Fused corundum bricks have high purity and are difficult to sinter. They need to be fired at a temperature higher than 1800°C. Commonly used firing equipment includes high-temperature batch kilns or small high-temperature tunnel kilns.

Electrofused rebonded zirconium corundum bricks are made of AZS frit or electrofused AZS waste bricks as raw materials, with a small amount of kaolin or oxidized polymer added as a binding agent. At a certain temperature, the AZS electrofusion material exudes the glass phase and forms mullite and sintered bricks with the adhesive. The firing temperature needs to be 1600~1700°C. The chemical phase composition of the frit is very uniform, with less glass phase content. The chemical composition of waste bricks is uneven and has a high glass phase content (15%~25%). Compared with fused corundum bricks and fused refractory bricks, glass phase infiltration is significantly reduced, the infiltration temperature is increased, and the thermal shock resistance is good. It has good high-temperature mechanical properties, especially good creep and corrosion resistance.

Fused corundum bricks are dense. With the rapid development of modern industry, petrochemical, metallurgical, and other industries have increasingly higher requirements for it, which must not only have high-temperature strength but also have good thermal stability and corrosion resistance. Therefore, dense 99 fused corundum bricks were developed and used in heating furnaces. This kind of brick not only has a breakthrough in strength but also has a significant improvement in thermal shock resistance.

RS Refractory Brick Lining Solution

What should I do if the refractory material cracks, falls off, or is easily worn? Rongsheng Refractory dug out the root causes and analyzed the real reasons to make the kiln run longer! Zhengzhou Rongsheng Kiln Refractory Materials Co., Ltd. has been engaged in refractory production, research, and development services for many years. Welcome to contact us to get free refractory lining solutions and quotations.

Why Choose Corundum Silicon Carbide Bricks for High Temperature Furnaces?

Introduction: Corundum silicon carbide bricks have good thermal stability, good corrosion resistance, high thermal conductivity, and energy-saving materials, and are suitable for industrial furnaces.

1. Good wear resistance.
2. Corrosion resistance.
3. Thermal shock resistance.

Corundum Silicon Carbide Brick

Corundum silicon carbide brick is a hot-selling refractory brick from Rongsheng refractory brick manufacturer. Suitable for aluminum electrolytic cell lining, aluminum melting tube and ceramic kiln, large and medium-sized blast furnace bottom, waist and belly, aluminum refining furnace lining, zinc distillation furnace application tank lining produced by Rongsheng manufacturer. High thermal conductivity, good wear resistance, and thermal shock resistance. Corrosion-resistant corundum-SiC bricks and corundum silicon carbide bricks are available in standard chrome brick sizes and categories with competitive prices and high-quality products. Other specifications and sizes of corundum silicon carbide fireproof bricks are based on customer requirements, welcome to contact us or send us an email for a free quote.

Corundum Silicon Carbide Brick

Rongsheng refractory brick manufacturer insists on surviving by quality, constantly improve the technological content and technical level of its products, and continuously launches new products. Pursue providing customers with satisfactory and efficient services at the right price and with the best products!

What are the characteristics of corundum composite silicon carbide bricks?

Corundum silicon carbide brick is a high-performance ceramic material with the advantages of good thermal stability, corrosion resistance, high thermal conductivity, and energy-saving materials. The main characteristics of corundum silicon carbide bricks will be explained in detail below:

1. Good wear resistance. Corundum silicon carbide bricks have extremely high hardness and wear resistance and can be used for a long time without wear in harsh working environments such as high temperatures and high pressure.
2. Corrosion resistance. Corundum silicon carbide bricks are resistant to corrosive media such as acids and alkalis and are not easily corroded and worn. They can be used in highly corrosive situations such as the chemical industry.
3. Thermal shock resistance. Corundum silicon carbide bricks have good thermal stability and thermal shock resistance at high temperatures, can withstand large temperature differences and thermal shocks, and are not prone to cracking and breakage.
4. High thermal conductivity. Corundum silicon carbide bricks have excellent thermal conductivity properties and can transfer heat quickly, making the heating and cooling process more efficient.
5. Energy-saving materials. Because corundum silicon carbide bricks have excellent thermal conductivity, they can reduce heating and cooling time and energy consumption, so they are an energy-saving material.

Corundum silicon carbide bricks are made of silicon carbide (sic) as the main raw material, with various binders according to requirements, and are formed by high pressure. Corundum silicon carbide brick products have good thermal stability, high thermal conductivity, and good corrosion resistance. They are ideal energy-saving materials for industrial kilns.

Composite Corundum Silicon Carbide Brick

Characteristics of corundum silicon carbide bricks

1. Corundum silicon carbide has good stability in acid, alkaline slag, metal, and glass solutions. Corundum silicon carbide refractory bricks can be used in oxidizing atmospheres at high temperatures or reducing atmospheres.
2. Refractory corundum silicon carbide bricks have high thermal conductivity, good mechanical properties, excellent alkali resistance, slag resistance, and thermal shock resistance. Silicon carbide brick-corundum is expected to be used as blast furnace lining.
3. Corundum SiC bricks are resistant to acid and alkali slag and have high strength, a small thermal expansion coefficient, good thermal conductivity, and good thermal stability.

Why choose corundum silicon carbide bricks for application in high-temperature furnaces

1. Refractory materials are often used in the construction of kilns, and SiC bricks are wear-resistant products of refractory materials. Corundum SiC bricks are made of brown fused alumina or white corundum and tabular corundum. It adds silicon carbide powder and silicon carbide particles. After scientific matching, it is formed under high pressure and fired in a high-temperature kiln. Reliable refractory materials.
2. The high-temperature resistance, corrosion resistance, and wear resistance of corundum silicon carbide bricks are widely used in blast furnace bodies, tuyere composite bricks, slag joint bricks, iron joint bricks, and other steel industries. It is an ideal substitute for traditional corundum bricks. In the kiln mouth and transition zone of the cement rotary kiln, corundum silicon carbide is also used to replace the traditional anti-stripping high alumina bricks and silicon molybdenum. The wear-resistant effect and anti-peeling effect are very obvious.

Corundum silicon carbide refractory brick packaging is general export packaging with general fumigation wooden pallets, paper corner protectors, plastic steel strips, and plastic shrink film protection outside, special packaging, or according to customer requirements.

Production Process of Magnesia Carbon Bricks

Magnesia-carbon bricks are carbon-bonded alkaline bricks that are prepared from magnesia, carbon raw materials, organic binders, and admixtures and are kneaded, high-pressure formed, and treated at low temperatures. This brick takes full advantage of the advantages of alkaline materials and carbon materials, so it has excellent thermal shock resistance, peeling resistance, slag resistance, and high-temperature creep resistance. Magnesia carbon brick is an ideal lining material for metallurgical smelting furnaces and has received great attention from various countries. At present, our country can produce ordinary and high-strength magnesia carbon bricks, as well as functional products such as magnesia carbon breathable bricks, which can basically meet the needs of the development of the metallurgical industry.

Rongsheng Magnesia Carbon Bricks

Magnesium Carbon Refractory Material Furnace Lining

Magnesia-carbon refractory materials are used as furnace lining refractory materials. They effectively utilize the slag corrosion resistance of magnesia and the high thermal conductivity and low expansion of carbon, compensating for the biggest shortcoming of magnesia’s poor spalling resistance. It mainly has the following excellent properties.

(1) High-temperature resistance.

MgO and C have no eutectic relationship at high temperatures, and their melting points are both relatively high. The melting point of magnesium oxide is 2800°C, and the melting point of carbon is above 3000°C. Therefore, the magnesium-carbon refractory material made by combining the two has a higher melting point and better high-temperature resistance.

(2) Strong resistance to alkaline slag corrosion.

MgO itself has strong resistance to alkaline slag and high-speed iron slag. The wetting angle of graphite to slag is large, and its wetting performance with molten slag is very poor.

(3) Good thermal shock stability.

Among magnesia-carbon refractory materials, graphite has a high thermal conductivity, a low thermal expansion coefficient, and a small elastic modulus. Therefore, the refractory material has good thermal shock stability.

The performance of MgO-C bricks is mainly affected by the main and auxiliary raw materials and chemical composition, the relative content of each component, and the mixture structure. However, the type of binder, processing, and molding techniques also play an equally important role.

MgO-C bricks

Magnesia Carbon Bricks Production Process

Selection of raw materials. The raw materials for producing MgO-C bricks (https://rsrefractoryfirebrick.com/magnesia-carbon-bricks) are mainly magnesia. Its technical requirements are high purity, few impurities, complete particle crystal development, uniform texture, low porosity, and high volume density. Magnesia is divided into fused magnesia and sintered magnesia, but gradually replacing part of the sintered magnesia with fused magnesia can significantly improve corrosion resistance. The carbon raw material generally uses natural flake graphite. It has no eutectic relationship with oxides such as MgO and does not form low-melting materials. It has high thermal conductivity, small elastic modulus, low thermal expansion coefficient, and is non-wetting.

The binder is the key material for the production of MgO-C bricks. Its technical requirements include: (1) The wetting angle for carbon materials is small and the affinity is good. (2) The residual carbon rate is high. (3) Less impurities and moisture content. Commonly used binding agents include phenolic resin, modified phenolic resin, and tar asphalt. Nowadays, most MgO-C bricks are produced using synthetic phenolic resin. Admixtures mainly include unit metals and multi-element metal powders such as Al, Mg, Si, Al-Mg, AI-Si, and Al-Mg-Ca. B4C, Al8BC7, Al4SiC4, and other carbon pure substances and complex alkalized substances. As well as borides such as ZrB2, MgB, CaB6.

Proportion. 5-1(3-1)mm magnesia 50~60%. <1mm magnesia 10%. <0.074mm magnesia+graphite+additive 30~40%. Resin 5% (additional).

Drill. The feeding sequence is generally magnesia particles – binder – graphite – magnesia fine powder and mixed fine powder of additives. It is best to perform it in kneading equipment with a heating device so that the resin has good flow properties and can achieve uniform distribution.

forming. When using a hydraulic press to produce MgO-C bricks, the pressure is generally required to reach 115~200MPa. The number of pressurization times cannot be less than 15 times.

Magnesia carbon brick molding

heat treatment. MgO-C bricks are generally processed at a temperature of 200~250℃. heating system. 50~60℃, because the resin softens, it should be kept warm. 100~110℃, a large amount of solvent will be discharged, so it should be kept warm. 200 or 250℃, to complete the reaction, it should be kept warm.

It is not difficult to see that the production of MgO-C bricks has reached its limit from raw materials to technology. Therefore, the performance improvement of existing MgO-C bricks will be slow and very limited. In addition, resources are limited. Since graphite is easily oxidized, the high-temperature reaction between magnesium chloride and graphite always exists, especially in a vacuum metallurgical environment.

The redox reaction of MgO-C bricks and the redox reaction of oxide inclusions and carbon are determined by the nature of the material. The ease of oxidation of graphite is the dominant aspect that determines this nature. Therefore, artificial modification of graphite is an effective way to solve this problem. Only in this way can the chemical compatibility conditions of MgO-C bricks be further improved, thereby promoting the development of MgO-C bricks.

Creep Characteristics of Sillimanite Bricks for Blast Furnace

Sillimanite bricks have the characteristics of high softening temperature under load, good thermal shock stability, good wear resistance, and slag resistance. Sillimanite bricks are suitable for lining various parts of industrial kilns in steel, chemical, glass, ceramics, and other industrial sectors. Such as flue, combustion chamber, furnace door, furnace column, furnace wall, inner pair, and a sliding plate of steel drum, etc.

Rongsheng Sillimanite Bricks for Sale

The Raw Material Ratio of Sillimanite Bricks for Blast Furnace

Sillimanite bricks are mainly used in blast furnaces in the form of large composite bricks. Its key technical indicators are apparent porosity and thermal stability. The blast furnace tuyere is subject to the high-speed erosion of high-temperature hot air and the impact and erosion of hot slag iron. The tuyere walls have to withstand thermal stress caused by the temperature difference between inside and outside, and some are affected by the abrasion of pulverized coal and the impact of lumpy furnace charges. It is necessary to ensure the stability and sealing of the lining structure to avoid the intrusion and precipitation of alkaline substances, or to prevent air leakage from the air outlet. Only when the material is dense and has low porosity can it effectively withstand the impact of airflow and melt. Therefore, the large sillimanite composite brick structure is selected as the lining refractory material in the taphole and tuyere area.

Sillimanite bricks for blast furnaces use andalusite, second-class alumina aggregate, sillimanite, clay, micro powder, sintered mullite, and fused corundum as basic raw materials. Mix in advance to form a mixed powder. The binding agent is a pulp aqueous solution with a specific gravity of 1.26g/cm3 and an added amount of about 2.4%.

Adding sillimanite improves the thermal shock stability of the material, and the mullite crystal phase plays an important role. The alumina in the ingredients obtains fine interlaced mullite and glass phases at high temperatures. The matrix sillimanite is suitable for combination with α-Al2O3 or high alumina bauxite to generate mullite, including primary and secondary mullite. The mullite crystal phase and the introduction of minerals with small linear expansion coefficients or large thermal conductivities are naturally beneficial to the material’s thermal shock resistance. Good thermal shock resistance.

Sillimanite High Alumina Bricks from Rs Refractory Factory

Creep Characteristics of Sillimanite High Alumina Bricks

Bricks that add part of sillimanite to fired-high alumina bricks are customarily called sillimanite bricks and are collectively referred to as sillimanite-high alumina bricks. It is a variety of modified high alumina bricks. High-alumina brick experts and others have conducted in-depth and systematic research on the creep characteristics and mechanisms of sillimanite bricks. They divided the creep curves of the developed 1400-1500°C sillimanite bricks into three types.

The first type. conforms to the usual creep curve pattern. The initial stage is the deceleration pupal stage in which the creep rate gradually decreases. This is followed by the isokinetic creep stage with a constant creep rate and increasing creep rate. This type of creep curve mostly appears in low-creep bricks with an operating temperature of 1400~1500°C. This type of sillimanite brick is brick with sillimanite added to ordinary fired high alumina bricks.

The second type. The initial stage of the creep curve is the deceleration creep stage in which the creep rate decreases. After a certain period of time, the creep rate reaches zero. The creep rate does not change with time, that is, the creep rate remains stable.

The third type. The creep curve first has a deceleration creep stage in which the creep rate decreases. When the creep rate reaches the maximum, the creep rate becomes negative. The stage where the creep rate gradually decreases mostly occurs between 1500 and 1550°C. Low-creep high alumina bricks are bricks with sillimanite and corundum added to ordinary high alumina bricks.

Research on the high-temperature creep behavior of my country’s DK-type sintered high-alumina bauxite materials pointed out that the factors controlling creep are the glass effect (the amount and viscosity of the glass matrix) and the crystallization effect (the degree and mode of contact or combination between crystals). Which one is dominant depends on phase composition and microstructure. Li Tingshou et al. also clearly pointed out in their research the high-temperature creep properties of mullite-corundum series materials. The high-temperature creep properties of materials are closely related to phase composition and microstructure. Regarding the creep control factors of sillimanite bricks, Sun Gengchen et al. specifically pointed out that they are controlled by three factors. In addition to the glass effect and crystallization effect, there is also the mulliteization effect of sillimanite. When the glass effect is dominant, the creep rate of the material is positive and the creep curve behaves as the first type. When the mulliteization effect and crystallization effect of sillimanite is dominant, that is, when the expansion effect is dominant, the pupa transformation rate is negative and the creep rate behaves as the third type. When the two opposite effects are equal, compression and expansion cancel out, and the creep curve behaves as the second type.

The above discussion provides a theoretical basis for the development of low creep high alumina bricks. However, there are still many varieties of sillimanite low-creep high-alumina bricks. In addition to bricks that add sillimanite to ordinary high alumina bricks, bricks that add sillimanite and corundum to ordinary high alumina bricks, there are also bricks that add sillimanite to synthetic mullite raw materials. High alumina bricks with sillimanite added to corundum raw materials, etc. There will be some differences in the creep curves of these sillimanite low creep high alumina bricks. Awaiting further research.

What should I do if the refractory material cracks, falls off, or is easily worn? To solve the problem, you need to dig into the root cause and analyze the real cause. Rongsheng Refractory Materials Factory has been engaged in refractory production and R&D services for many years. It can solve various difficult problems in high-temperature kiln linings. We welcome new and old friends to consult and exchange technology. Choose Rongsheng as a refractory material, and your economic longevity is guaranteed. Choose Rongsheng for lining repairs, and the packaged materials will be more durable!

What Should you Pay Attention to When Purchasing Alumina Bubble Bricks?

Alumina Bubble Bricks actually have alumina hollow balls and alumina powder as the main raw materials. It is combined with some other binding agents and then fired at a high temperature of 1750 degrees. It is a kind of ultra-high temperature energy-saving insulation material.

Rongsheng Alumina Bubble Bricks

These alumina hollow balls are actually a new type of high-temperature insulation material. It is made of industrial alumina smelted and blown in an electric furnace, and its crystal form is α-Al2O3 microcrystals. It is based on alumina hollow balls and can be made into products of various shapes. Its maximum operating temperature is 1800°C, and its products have high mechanical strength, several times that of ordinary lightweight products. Its bulk density is only one-half of corundum products. It is widely used in high-temperature and ultra-high-temperature kilns such as gasification furnaces in the petrochemical industry, carbon black industrial reactors, and induction furnaces in the metallurgical industry. All achieved very satisfactory energy-saving results.

Alumina hollow balls have obvious thermal insulation properties and their thermal conductivity is low, so they can have a good thermal insulation effect. It can reduce the dissipation of heat, thereby improving thermal efficiency, thereby saving energy. Its energy-saving effect can reach more than 30%.

Alumina Bubble Bricks Insulating Bricks

When purchasing Alumina Bubble Bricks, you need to pay attention to the following points.

1. Material quality. The main component of Alumina Bubble Bricks is alumina. Therefore, it is necessary to choose alumina with high purity and stable quality as raw material for production.
2. Production process. The process of producing Alumina Bubble Bricks is also very important. Advanced technology and equipment must be used to ensure product quality and stability.
3. Specifications and dimensions. Depending on the use occasion, the specifications and sizes of Alumina Bubble Bricks also vary. Be sure to choose the appropriate size based on actual needs.
4. Brand credibility. When choosing a supplier of Alumina Bubble Bricks, pay attention to choosing a reputable and experienced brand. To ensure product quality and after-sales service.
5. Price comparison. Finally, compare prices from different suppliers. Combined with the above points, we selected the most cost-effective supplier of Alumina Bubble Bricks.

Are Alumina Bubble Bricks Resistant to Acid and Alkali Corrosion?

Alumina Bubble Bricks are a high-temperature refractory material with excellent acid and alkali corrosion resistance. Its main raw material is alumina, which has the characteristics of high purity, high hardness, and high-temperature resistance.

1. Acid resistance. Alumina Bubble Bricks have excellent acid resistance and can resist the erosion of many corrosive acids. Such as sulfuric acid, hydrochloric acid, hydrofluoric acid, etc.
2. Alkali resistance. Similarly, Alumina Bubble Bricks also have excellent alkali resistance and can resist the erosion of strong alkali liquid. Such as sodium hydroxide, potassium hydroxide, etc.
3. Corrosion resistance. Alumina Bubble Bricks have excellent corrosion resistance and can resist corrosion from various chemical substances, including acids, alkalis, salts, etc.
4. High-temperature stability. The acid and alkali corrosion resistance of Alumina Bubble Bricks mainly comes from its high-temperature stability. At high temperatures, Alumina Bubble Bricks will not undergo chemical reactions and will not be corroded.

In summary, Alumina Bubble Bricks have excellent acid and alkali corrosion resistance. The main reason is its high-temperature stability and ability to resist corrosion from various chemicals. Therefore, Alumina Bubble Bricks are widely used in refractory building materials, refractory equipment, and other fields under harsh environments such as high temperature, acid, and alkali.

Customized Refractory Bricks for Commercial Stove Cores from RS Refractory Factory

The technology of using refractory bricks in commercial kitchen stoves is a new industry that has just emerged in recent years. It is also a new product derived under the conditions of supply and demand as people’s consumption levels continue to improve and the quality of life improves. In the early years, refractory bricks for commercial stoves were simple and rough in appearance and not durable. The production process is to use a part of refractory mud or refractory aggregate mixed with refractory cement and apply it by hand to form a layer of refractory brick lining. Currently, this method is rarely used. Custom design of refractory bricks for commercial stove cores from RS Refractory Factory. If your order quantity is large, our price will also be very favorable.

Commercial kitchen stoves are very common in professional fields and institutions with a large number of diners. For example, large star-rated hotels, school canteens, large enterprises, hospital canteens, and other places with a large number of diners can be equipped with such stoves. The overall structure of the stove is simple and easy to operate, and the furnace is lined with refractory bricks. RS cheap fire bricks for sale. Refractory brick manufacturers have adjusted the raw material configuration and improved the production process according to the customer’s usage and problems during use. They can customize refractory bricks for commercial kitchen stoves according to the customer’s specific usage.

Stove furnace refractory bricks are mainly used in the core of the furnace. During the cooking process in the kitchen, it has to withstand temperatures of about 600~800°C and is accompanied by indirect flameouts and ceasefires. The usage time is also started and stopped according to the meal time. During the cooking process, some moisture will flow into the refractory brick layer in the furnace, causing a considerable amount of cold water surge. According to the above usage conditions, our company first produced a batch of experimental furnace refractory bricks based on the customer’s drawing requirements. The material is made of grade three high aluminum material. The brick shape is as shown below. After the production is completed, the furnace refractory brick products are sent to the customer’s factory. Collect customer feedback information in a timely manner. There are the following types of damage to refractory bricks. First of all, some furnace refractory bricks were directly broken due to transportation reasons. Secondly, when the furnace refractory bricks were installed on the stove and the stove was turned on, some of the cracks that occurred became smaller and larger. There are vertical cracks that turn into penetrating cracks, and the product is damaged in different situations.

Customized Refractory Bricks for Commercial Stove Cores

However, in terms of the overall shape, structure and size, our company has maintained the original shape and the basic error is very small. After summarizing the causes of damage, the raw material configuration and production process of the stove hearth bricks were improved before formal mass production. The improvements can be divided into five parts. RS Refractory Brick Manufacturer will conduct a detailed analysis and introduction.

First, small cracks appear on the surface of the furnace refractory bricks after sintering, especially in the lower part of the middle opening. The reason why cracks are prone to occur in this part is that the aperture area is large, and the aperture has step layering when the wall is thin. Secondly, the mold in this part is not easy to demould, and manual demoulding is required when demoulding after pressing and molding. Once the hand shakes when demoulding, there will be bumps and small cracks will be left. The cracks are very obvious after sintering, and this part is also the main reason for the high scrap rate. It is recommended to improve the method by changing the steps inside the opening to a parallel structure without steps.

Second, the wall thickness of the outer and inner diameters of the furnace refractory bricks is thin. Now based on the size, the average wall thickness is 30mm, and the maximum opening outer diameter is 420mm. The outer diameter is large and the wall thickness is thin, so you may accidentally touch it when de-moulding. Then, there is also concern about deformation during the sintering process. So it is best to imagine that the wall thickness can be increased to 50mm.

Third, the current furnace refractory bricks have snap-on buckles on the upper and lower openings. After the production is completed, the bricks are advanced to the drying kiln. When placing it on the kiln car, since both sides have buckles and the support wall thickness on one side is only 15mm, it is very thin and cannot support the weight of the upper part. In addition, when the gas is exhausted during the drying process, in order to avoid the lower part from breaking and de-forming when placing the kiln car, it can only be placed in one layer and cannot be stacked. Therefore, if the lower snap buckle can be changed to a flat snap, the damage to the bricks will be reduced a lot and the appearance after sintering can be guaranteed.

Fourth, add charred gemstone andalusite to the high-aluminum materials currently used in production to improve the thermal shock stability and linear change rate of the material. It is generally believed that there are two reasons. First, the added andalusite turns into mullite at high temperatures, increasing the mullite content. At the same time, the interwoven structure formed by needle-columnar mullite is beneficial to thermal shock stability. Secondly, the incomplete mulliteization of andalusite forms multiple composite structures, which facilitates the adaptation of the expansion coefficients of various minerals, thereby improving thermal shock stability.

Fifth, change the previous packaging method. Although the strength of the sintered product is already very high, because the brick type has snap-on buckles at both ends, it is not flat. When placing the pallet, the furnace refractory bricks cannot be stacked very stably. The bumps of the car during transportation caused the refractory bricks to lose weight and eventually break.

To purchase high-quality and cheap refractory brick products and customize various special-shaped refractory brick products, please choose a powerful refractory brick manufacturer. Our RS refractory brick manufacturer has an annual output of 6W tons and our products are sold to more than 100 countries and regions around the world. The factory is large and powerful, with ready stock reserves and fast delivery.

Why do Silicon Carbide Refractory Bricks Have Good Thermal Shock Resistance?

Silicon carbide refractory brick is a special ceramic material with excellent properties. It is made of high-purity silicon carbide powder through molding, sintering, and other processes. Silicon carbide bricks have extremely high hardness and anti-wear properties and are widely used in various industrial fields. Why do silicon carbide refractory bricks have good thermal shock resistance? RS Refractory Brick Manufacturer is a refractory brick manufacturer with rich production and sales experience. Based on years of production and sales experience, we provide you with high-quality high-alumina silicon carbide bricks, and silicon carbide refractory bricks suitable for your production needs.

Rongsheng Silicon Carbide Refractory Bricks

Thermal Shock Resistance of Silicon Carbide Refractory Bricks

Silicon carbide refractory bricks have good thermal shock resistance, mainly due to their special structure and properties.

First of all, silicon carbide has a high melting point (2700°C) and can exist stably at high temperatures. Therefore, silicon carbide bricks can maintain structural stability at high temperatures and are not prone to thermal expansion and brittleness.

Secondly, the structure of silicon carbide bricks is reticular, with high internal porosity and elastic deformation ability at high temperatures. At high temperatures, silicon carbide refractory bricks can thermally expand and contract through internal pores, thereby reducing the concentration of thermal stress and improving thermal shock performance.

In addition, silicon carbide refractory bricks have very high chemical stability and are not susceptible to chemical attack and corrosion. This chemical stability allows silicon carbide bricks to maintain good performance when used in various harsh environments, such as acidic, alkaline, high-temperature, and high-pressure environments.

To sum up, the good thermal shock resistance of silicon carbide bricks is due to their high melting point, network structure, high internal porosity, and high chemical stability. These characteristics allow silicon carbide refractory bricks to maintain good performance and stability under high temperatures, high pressure, and harsh environments.

Silicon Carbide Refractory Bricks Have Good Thermal Shock Resistance

High-Quality Performance Characteristics of Silicon Carbide Bricks

First, silicon carbide bricks have extremely high hardness. Its hardness is second only to diamond and boron nitride, and it is a ceramic material with higher hardness. This gives silicon carbide refractory bricks excellent wear resistance and the ability to maintain good performance over a long period of time under harsh working conditions.

Secondly, silicon carbide bricks have excellent high-temperature resistance. Its melting point is as high as 2700°C and it can work stably in high-temperature environments. Compared with other ceramic materials, silicon carbide refractory bricks can withstand higher temperatures and still maintain excellent physical and chemical properties at high temperatures.

In addition, silicon carbide bricks also have good corrosion resistance. It has high stability in corrosive media such as acid and alkali, can effectively resist corrosion and erosion, and prolongs service life.

There are various preparation processes for silicon carbide refractory bricks, the common ones are the pressing sintering method and the coating method. The press sintering method is to mix silicon carbide powder and other additives evenly, press it through a mold, and then sinter it at high temperatures. The coating method is to mix silicon carbide powder and binder and then apply it on the substrate, and then form it through drying, sintering, and other processes.

Silicon carbide bricks have a wide range of applications. In the metallurgical industry, it is often used in high-temperature furnace linings, crucibles, protective tubes, and other wear-resistant and corrosion-resistant parts. In the chemical industry, it is widely used as the lining of acid and alkali-resistant containers, pump bodies, valves, and other equipment. In addition, silicon carbide refractory bricks are also used in electric power, machinery, semiconductors, and other fields to manufacture high-temperature furnaces and high-speed cutting tools.

What Technical Measures Should be Taken to Improve the Life of Magnesia Carbon Brick Furnace Walls?

Magnesia carbon bricks have evolved from tar-bonded bricks and fired oil-immersed bricks in recent years. It is made of sintered magnesite or fused magnesite and carbon material graphite as raw materials. Using carbon-containing resin as a binder, after mixing, molding, and heat treatment at about 220°C, the carbon forms a continuous network phase to wrap the periclase grains. Based on the usage characteristics of magnesia carbon bricks and the requirements of the working environment, what technical measures should be taken to improve the life of magnesia carbon brick furnace walls? It is also the common goal of refractory brick material manufacturers and enterprises.

Magnesia Carbon Bricks for Ladle

The main characteristics of magnesia carbon bricks

① When pressed, graphite tends to have a layered structure, and the bonding between graphites and between graphite and periclase is poor and loose. Therefore, the normal temperature strength of magnesia carbon bricks is low. In order to improve the density and strength of bricks, they must be formed by high pressure.

② Graphite has low thermal expansion and high thermal conductivity, and magnesia carbon bricks have good thermal shock resistance.

③ Graphite is not wetted by slag and has high chemical stability. Therefore, when the carbon in magnesia carbon bricks forms a continuous network, it has strong slag resistance.

④ The carbon in magnesia carbon bricks is easily oxidized. When baking at low temperatures, it must be done in isolation from the air and cannot be fired in the air. Adding a small amount of fine powders such as Al, Si, Mg, and carbide to magnesia carbon bricks can also prevent the oxidation of carbon.

RS Magnesia Carbon Bricks for the Steel Ladle

What technical measures should be taken to improve the life of magnesia carbon brick furnace walls?

(1) Increase the proportion of large-grained magnesia and increase the volume density of the furnace lining

The erosion of refractory materials by slag and the redox reaction of MgO-C start from the grain boundaries and foreign substances located at the grain boundaries. The use of high-purity, large crystalline magnesia helps improve the corrosion resistance and oxidation resistance of magnesia carbon bricks.

(2)Using high-purity graphite

The use of high-purity graphite to make bricks has also received attention. The type and particle size distribution of graphite has an impact on the porosity, high-temperature strength, and MgO-C reaction of bricks in oxidizing and reducing atmospheres after carbonization.

(3)Add additives

Metal additives such as Al, Si, and Mg or their mixtures and alloys are easier to react with oxygen than graphite. Therefore, it plays a role in preventing the oxidation of graphite, and the carbide formed can improve the mechanical properties of the brick.

Research on non-oxide additives is increasing day by day, mainly boride, carbide, and nitride have high oxygen affinity. Their oxides can form a liquid protective layer on the surface of the bricks.

(4) Vacuum oil immersion

At high temperatures, CO escapes from magnesia-carbon bricks, resulting in carbon loss. The increase in apparent porosity after carbonization will affect its service life. Oil-immersing the bricks can seal the pores and reduce the porosity after carbonization. Improving corrosion resistance is also a way to improve the quality of magnesia carbon bricks.

After vacuum oil immersion, magnesia carbon bricks are used for slag lines and hot spots in high-temperature areas of electric furnace walls. It not only improves the performance of bricks but also avoids the potential hazards caused by the use of metal additives.

(5)Choose the appropriate binding agent

Phenolic resin binders have high residual carbon content after pyrolysis. The highest residual carbon content is 50% to 60% and rarely reaches 70%. The hardened high-polymer resin has good uniformity, few defects in the network structure, high strength, and less environmental pollution.

Asphalt binders can be better graphitized and have higher antioxidant stability. However, cracks are easy to occur inside the bonded carbon and the strength of the product is reduced.

The application of asphalt-resin composite forms a fine mosaic structure, which enhances the fracture toughness of the carbon bond and strengthens the carbon bond to improve oxidation resistance. The practical application effect is good.

The damage process of magnesia carbon bricks during use is oxidative decarburization ➡ loose structure ➡ erosion ➡ erosion. The oxidation rate of carbon can be slowed down with the help of antioxidants. The practice has proved that adding metal or alloy powder can improve the performance of magnesia carbon bricks, and the use effect is better. When the addition amount is 3%~5%, the high-temperature flexural strength is increased by about 3 times. This is because oxides, carbides, and new mineral phases of corresponding metals are generated in the bricks, which block the pores and reduce the permeability of the product, thereby inhibiting or slowing down the oxidation of carbon and improving the high-temperature performance of the product. Of course, there will also be other shortcomings in the use of magnesia carbon bricks. Through many experiments, improving the raw material configuration of magnesia-carbon bricks and the use of additives will make up for the shortcomings of magnesia-carbon bricks and enable magnesia-carbon bricks to achieve their best performance.

Preparation Technology of High Performance Composite Carbon Brick for Blast Furnace

Microporous carbon bricks, ultra-microporous carbon bricks, and graphite bricks are refractory materials commonly used in blast furnace hearths and bottoms, which play an important role in prolonging the service life of blast furnaces. However, there are certain defects and deficiencies in the ceramic cup combined with carbon brick. In order to ensure the performance stability of carbon bricks for blast furnaces, the preparation process of titanium-based composite carbon bricks was analyzed. To clarify the amount of various refractory materials added, the composite carbon brick can have better corrosion resistance.

RS High-Quality Carbon Bricks

Characteristics of traditional graphite carbon bricks

Graphite carbon brick company’s impregnated graphite carbon plate and graphite carbon brick have the following characteristics.

1. Excellent chemical stability, erosion resistance, wear resistance, and low porosity. Has excellent corrosion resistance.
2. Its own quality and volume are constant, heat conduction, and temperature resistance. It will not burst and break due to drastic changes in temperature.
3. During construction, the medium will not be polluted and will not be covered by impurities. It is easy to clean, and the heat transfer effect will not be reduced after long-term use. Excellent curing process, especially suitable for equipment anti-corrosion in strong corrosive media.
4. Small thermal expansion coefficient and low linear change rate. Used within the range of 180 degrees, its performance is stable and durable.
5. The overall size can fully meet the requirements of construction masonry technology. The size of graphite carbon bricks can be customized according to the actual needs of customers. All special-shaped graphite carbon bricks based on 230*113*65, such as thick and wide models, arched corner bricks, fan-shaped bricks, etc., are produced according to the requirements of the user’s drawings.

Impregnated graphite carbon plate, graphite carbon brick. RS refractory brick manufacturers (https://rsrefractoryfirebrick.com/) can provide a variety of high-quality graphite carbon brick products. Anti-corrosion carbon bricks, carbon plates, impregnated graphite carbon bricks, carbon plates, anti-corrosion carbon bricks, high-temperature resistance, and anti-corrosion carbon plate carbon bricks can all be customized.

Types and composition analysis of titanium-containing materials in composite carbon bricks for blast furnace longevity

Blast furnace longevity has always been the focus of research in the metallurgical industry. Under normal circumstances, the temperature of the side wall and furnace bottom of the blast furnace will show abnormal fluctuations when the smelting intensity gradually increases. It affects the service life of blast furnaces to a great extent. By adding a certain proportion of titanium-containing compounds into the blast furnace, the stable operation of the blast furnace can be guaranteed. The commonly used titanium-containing materials include FeO, SiO2, TFe, TiO2, etc. The types of materials include sinter, pellets, cold consolidated pellets, etc. The performance studies of these materials are representative to a certain extent, and the origin of the materials is different, so there are certain differences in the fluctuation range of the average mass fraction. Among them, the average value of TFe mass fraction fluctuates widely, within the range of 30.58%-61.00%. In order to meet the requirements for the preparation of titanium-based composite carbon bricks for test blast furnaces, it is necessary to select titanium-containing materials with stable iron-containing grades and good economical efficiency.

Preparation Technology of High-Performance Composite Carbon Brick for Blast Furnace

Determination of the additive ratio

For the preparation process test of titanium-based composite carbon bricks for blast furnaces, titanium compounds, silicon powder, silicon carbide, and white corundum are selected as additives, and three levels of each additive are selected for orthogonal experiments. Through the analysis of laboratory test results, various performance indicators of titanium-based composite carbon bricks are clarified. At the same time, through laboratory tests, the optimal ratio of additives is correspondingly expanded, and various sample numbers are marked to determine the ratio of additives. Then pass the performance index test to ensure the scientificity and authenticity of the test results.

Addition of additives to the paste

Through further experiments, it was found that using the original carbon brick preparation method, the micro powder grade materials would agglomerate after kneading, and the proportion of various additives was large, which was not conducive to the formation of material balls with stable performance. After certain adjustments are made in the way of adding additives to the paste, the following two test methods are summarized. First, adopt the method of encapsulation and pre-dispersion, first add various additives to the asphalt and thinner mixed in a certain proportion. This method can effectively improve the specific surface area of the additive and ensure the dispersion uniformity of the carbon brick paste to the greatest extent. Second, mix and knead high-quality coal powder and additives according to the optimal ratio determined by experiments. After the raw material is formed, the blank is roasted by high-temperature heat treatment. The dried blank is then pulverized to form a finer powder. This method can effectively reduce the thermal expansion of white corundum and titanium compounds during high-temperature heat treatment, and better solve the problem of uneven dispersion of additives in the paste. Fundamentally avoid many defects in the performance of products after high-temperature heat treatment, and ensure the excellence of various performance indicators.

Carbon brick-forming process

Titanium-based composite carbon bricks for blast furnaces are mainly formed by vibration. Through repeated testing of parameters such as vibration time, amplitude, frequency, feeding method, test vacuum degree, and excitation force. Defining the best process for preparing titanium-based composite carbon bricks fundamentally ensures the uniformity of the internal structure of the carbon bricks. At the same time, attention should also be paid to the temperature setting during high-temperature treatment, and the roasting curve can be used to clarify the process parameters suitable for the preparation of titanium-based composite carbon bricks. In order to ensure that the performance indicators of the carbon brick meet the expected assumptions.

Advantages and characteristics of titanium-based composite carbon bricks for blast furnaces

Through the analysis of previous studies, the high thermal conductivity of the carbon brick structure can be fully utilized, and a cooling system with a high level of performance can be obtained. However, the corrosion resistance of molten iron is poor. The corrosion resistance of the ceramic cup structure can separate the molten iron from the carbon brick. But the cooling effect exerted is low. The titanium-based composite carbon bricks developed and prepared, taking into account the advantages of carbon bricks and ceramic cups, are of great significance for prolonging the life of blast furnaces.

To purchase high-quality carbon bricks for blast furnaces, please contact RS refractory brick manufacturers. We provide free samples and quotations.

Zero Expansion Silica Brick for Glass Kiln – Fused Silica Brick

Silica brick is a common silica refractory material because of its good high-temperature strength and load-softening temperature. Excellent performance such as good high-temperature creep resistance and strong acid slag corrosion resistance. Therefore, it is widely used in industrial production. RS refractory brick manufacturers can provide high-quality zero-expansion silica bricks-fused silica bricks for glass kilns.

RS Silica Bricks for Sale of High-Quality

There are generally three crystal phases in silica bricks, namely tridymite, cristobalite, and a small amount of residual quartz, and the true density increases sequentially. Generally speaking, the true density, thermal expansion coefficient, tridymite, and residual quartz content are the key performance indicators to characterize silica bricks. The greater the degree of conversion of quartz into volume-stable tridymite and cristobalite with excellent high-temperature performance during the sintering process, the smaller the residual quartz content. The smaller the true density of silica bricks, the better the high-temperature volume stability and the smaller the re-expansion during use.

For different purposes, some properties of silica bricks, such as thermal conductivity, wear resistance, and thermal shock resistance, need to be further strengthened. At this time, in addition to rationally selecting silica raw materials and adding suitable mineralizers, it is also necessary to introduce a certain amount of additives to achieve the desired effect.

Characteristics of silica bricks

Silica bricks refer to acidic silica products with a SiO2 content greater than 93%. The properties of silica bricks include chemical mineral composition, true density, bulk density, refractoriness, load softening temperature, high-temperature volume stability, thermal shock resistance slag resistance, etc. It is closely related to many factors such as the nature of raw materials, crystal transformation status, and manufacturing process. Silica bricks are mostly used in vaults of coke ovens, hot blast stoves, glass kilns, tunnel kilns, and shelf bricks of various kilns. Especially in the coke oven (carbonization chamber, combustion chamber, regenerator) a large number of silica bricks are used.

SK-42 Silica Refractory Brick for Glass Kiln

Silica bricks for glass melting furnace

1. The volume is stable at high temperatures, and the furnace body will not change due to temperature fluctuations. Due to the high load softening temperature and low creep rate of silica bricks, the glass melting furnace can keep the furnace body without deformation at 1600 ° C, and the structure is stable.
2. No pollution to glass liquid. The main component of silica bricks is SiO2. If there are pieces or surface droplets during use, it will not affect the quality of the glass liquid.
3. Chemical corrosion resistance. The silica bricks of the upper structure are eroded by the gas containing R2O in the glass ingredients, and a smooth metamorphic layer is formed on the surface, which reduces the erosion rate and plays a protective role.
4. Small volume density. Can reduce the quality of the furnace body. The true density of high-quality silica bricks is 2.32-2.36g/cm3, and that of general silica brick products is 2.38-3.42g/cm3.

Although the refractoriness of silica bricks is not very high, the softening temperature under load is relatively high, and the high-temperature structural strength is high. Moreover, it has good stability when used for a long time above 600°C, and there is a total volume expansion of about 1.5~2.2% when heated to 1450°C. This residual expansion will make the cut joints close and ensure good air tightness and structural strength of the masonry. At the same time, it has the advantages of long service life and low energy consumption. Can resist the erosion of acidic slag. Therefore, it is mainly used for masonry glass furnaces and coke ovens. The partition wall of the coke oven carbonization chamber is built with silica bricks, which have good stability and airtightness under high temperatures, and the service life can reach 10-15 years. If used properly, it can last for more than 25 years.

RS Customized Fused Silica Tiles

Zero expansion silica brick for glass kiln

1. SiO2 content greater than 99%, excellent corrosion resistance, and acid resistance.
2. Low Fe2O3 content is less than 0.1%, no pollution to products (such as molten glass, etc.).
3. The low flux index (Al2O3+2R2O) is less than 0.3%.
4. The thermal expansion rate is close to zero, so there is no need to reserve expansion joints when repairing, which increases the tightness of the masonry.
5. Excellent thermal stability, the product will not burst during hot repair, and repair work can be carried out directly under the condition of high temperatures without stopping the furnace.
6. After repairing (hot repair), no peeling and other phenomena will occur, and it is safe and reliable for long-term use.
7. Good corrosion resistance, Due to the lack of calcium, corrosion cannot form.

Zero-expansion silica bricks are also called fused silica bricks or thermal shock-resistant silica bricks. It has anti-acid slag corrosion performance. Higher high-temperature strength. The temperature of softening under load is 1620～1670℃. Long-term use at high temperatures without deformation. Good thermal shock stability, heat exchange in water is 1~30 times. Natural silica is used as raw material, and an appropriate amount of mineralizer is added to promote the conversion of quartz in the green body into tridymite. Slow firing at 1350-14 30°C under a reducing atmosphere. In the process of firing silica bricks, why should they be fired slowly? Mainly to convert quartz into tridymite. The more tridymite, the smaller the true specific gravity and the higher the melting point. And because phosphorous quartz is a spearhead-shaped twin crystal, and the spearhead-shaped twin crystal will form an interlaced network structure, which endows the product with a higher softening temperature and mechanical strength. Therefore, it is generally hoped that as much tridymite exists in the fired silica brick. Followed by cristobalite, the less residual quartz the better.

Buy Silica Bricks for Glass Kiln, Zero Expansion Silica Bricks, Fused Silica Bricks, Get Prices and Samples for Free. Please contact the RS refractory brick manufacturer, at https://rsrefractoryfirebrick.com/.