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High-Performance Sillimanite Brick from China Factory - Heat-Resistant Refractory Suppliers for Industrial Applications
Core Advantages
Superior High-Temperature Stability
The sillimanite brick has a high refractoriness and a load softening start temperature of 1500–1650℃. During high-temperature operation, it can maintain stable physical and chemical properties without obvious deformation, effectively extending the service life of industrial kilns.
Excellent Corrosion & Wear Resistance
Rich in Al₂O₃ (50%–65%), the sillimanite brick has strong resistance to erosion by metallurgical molten slag, glass liquid and various chemical media. Its dense structure also ensures good high-temperature wear resistance, reducing material loss in harsh working environments.
Volume Stability
During the heating process, sillimanite undergoes mullitization reaction with slight volume expansion, which can offset the shrinkage caused by liquid phase generation. It has low high-temperature creep rate and excellent volume stability, ensuring the structural integrity of kiln linings.
Product Parameters
| Item | Sillimanite Brick | Sillimanite Brick | Andalusite Brick |
|---|---|---|---|
| Al₂O₃ % | ≥65 | ≥60 | ≥53 |
| SiO₂ % | ≤32 | ≤37 | — |
| Fe₂O₃ % | ≤0.6 | ≤1.0 | ≤1.7 |
| Bulk Density (g/cm³) | ≥2.50 | ≥2.30 | ≥2.40 |
| Apparent Porosity % | ≤18 | ≤19 | ≤20 |
| Cold Crushing Strength (MPa) | ≥80 | ≥80 | ≥60 |
| Refractoriness Under Load ℃ (0.2MPa, 0.6%) | ≥1650 | ≥1650 | ≥1600 |
Detailed Application Scenarios
1
Glass Industry
◎As a key refractory material in the glass industry, sillimanite brick is mainly used in the core parts of glass melting furnaces and forming equipment. It is suitable for the feed channel, feeder, tube drawing machine, float glass tin bath top cover, flow hole and other parts of daily-use glass, electronic glass and float glass production lines. The sillimanite brick has strong resistance to glass liquid erosion and low pollution to glass liquid, which can ensure the purity of glass products and improve the production efficiency of the furnace. It has been widely used in major glass manufacturers such as Qinhuangdao Yaohua Glass Group and Jiangsu Donghai Glass Factory.
2
Iron and Steel Industry
◎In the iron and steel industry, sillimanite brick is used in the lining of high-temperature kilns and equipment due to its excellent high-temperature stability and corrosion resistance. It is applicable to the furnace throat, furnace wall, flue, combustion chamber, steel ladle, slide plate and other parts of blast furnaces, hot blast stoves and soaking pits. It can withstand the erosion of high-temperature flue gas and molten steel, reduce the maintenance frequency of kilns, and ensure the continuous and stable operation of iron and steel production.
3
Ceramic Industry
◎The ceramic industry has high requirements for the temperature resistance and thermal shock resistance of refractory materials. Sillimanite brick is suitable for the kiln furniture, kiln wall, furnace door, arch brick and other parts of ceramic firing kilns (such as tunnel kilns and shuttle kilns). It can adapt to the frequent temperature changes in the ceramic firing process, avoid cracking and damage, and ensure the uniform heating of ceramic products, thus improving the qualified rate of ceramic products.
4
Chemical Industry
◎In the chemical industry, sillimanite brick is used in the lining of high-temperature reaction furnaces, incinerators and other equipment that are in contact with corrosive media. It can resist the erosion of various chemical media (such as acids, alkalis and molten salts) at high temperatures, maintain the structural stability of the equipment, and ensure the safety and efficiency of chemical production. It is also used in the production of high-strength unshaped refractory materials and heat-insulating refractory coatings.
Conclusion
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Frequently Asked Questions
What is sillimanite brick and what is it primarily made of?
Sillimanite brick is a high-alumina refractory product primarily composed of sillimanite mineral (Al₂O₃·SiO₂) and contains Al₂O₃ content ranging from 50% to 65%. It is manufactured through high-temperature sintering and is widely used in industrial kilns and furnaces requiring extreme heat resistance.
What is the maximum service temperature of sillimanite brick?
Sillimanite brick exhibits excellent high-temperature performance with a load softening start temperature of 1500–1650℃ and a refractoriness under load (0.2 MPa, 0.6%) of ≥1650℃, making it highly suitable for sustained high-temperature industrial applications.
How does sillimanite brick differ from andalusite brick?
While both belong to the alumino-silicate refractory family, sillimanite brick typically offers higher Al₂O₃ content (≥60–65% vs. ≥53%), higher bulk density, lower apparent porosity, and superior cold crushing strength and refractoriness under load compared to andalusite brick, making it more suitable for demanding high-temperature and corrosive environments.
In which industries is sillimanite brick most commonly used?
Sillimanite brick is widely used across the glass industry (melting furnaces, feed channels, float glass tin baths), the iron and steel industry (blast furnaces, hot blast stoves, steel ladles), the ceramic industry (tunnel kilns, shuttle kilns, kiln furniture), and the chemical industry (reaction furnaces, incinerators, and equipment exposed to corrosive media).
What makes sillimanite brick resistant to chemical corrosion?
The high Al₂O₃ content (50%–65%) and dense microstructure of sillimanite brick provide strong chemical inertness, enabling it to resist erosion from metallurgical molten slag, glass liquid, acids, alkalis, and molten salts at elevated temperatures. This makes it a reliable choice for environments involving aggressive chemical media.
What is the significance of the mullitization reaction in sillimanite brick?
During heating, sillimanite undergoes a mullitization reaction that causes a slight volume expansion. This expansion counteracts the shrinkage typically caused by liquid phase generation at high temperatures. The result is excellent volume stability and a low high-temperature creep rate, which are critical for maintaining the structural integrity of kiln linings over long service periods.