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High-Performance Sillimanite Brick Suppliers in China | Reliable Factory for Heat-Resistant Refractory Solutions
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
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.
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.
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.
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
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What is sillimanite brick and what is it made of?
Sillimanite brick is a high-alumina refractory product made primarily from sillimanite minerals, which belong to the Al₂O₃·SiO₂ system. The Al₂O₃ content typically ranges from 53% to 65%, giving it excellent high-temperature performance and chemical stability.
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What is the maximum service temperature of sillimanite brick?
Sillimanite brick has a refractoriness under load (0.2MPa, 0.6%) of ≥1600–1650℃, making it suitable for continuous use in high-temperature industrial environments such as glass furnaces, blast furnaces, and ceramic kilns.
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How does sillimanite brick compare to andalusite brick?
Sillimanite brick generally offers higher Al₂O₃ content (≥60–65% vs. ≥53%), higher cold crushing strength (≥80MPa vs. ≥60MPa), lower apparent porosity, and better refractoriness under load compared to andalusite brick, making it the preferred choice for more demanding applications.
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Which industries use sillimanite brick most commonly?
Sillimanite brick is widely used in the glass industry (melting furnaces, float glass lines), iron and steel industry (blast furnaces, hot blast stoves, steel ladles), ceramic industry (tunnel kilns, shuttle kilns), and chemical industry (high-temperature reaction furnaces and incinerators).
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Why does sillimanite brick exhibit good volume stability at high temperatures?
During heating, sillimanite undergoes a mullitization reaction that produces a slight volume expansion. This expansion offsets the shrinkage caused by liquid phase generation, resulting in a low high-temperature creep rate and excellent dimensional stability that preserves the structural integrity of kiln linings over time.
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Can sillimanite brick resist chemical corrosion from molten slag and glass?
Yes. The high Al₂O₃ content and dense microstructure of sillimanite brick give it strong resistance to erosion by metallurgical molten slag, glass melt, and various chemical media including acids, alkalis, and molten salts at elevated temperatures, making it highly durable in corrosive environments.