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Sillimanite Brick Suppliers in China | Heat-Resistant Refractory Brick Factory 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
Q
What is the maximum service temperature of sillimanite brick?
Sillimanite brick has a high refractoriness and a load softening start temperature of 1500–1650℃, making it suitable for use in industrial kilns operating at extreme high temperatures. The exact service temperature depends on the specific grade and working conditions.
Q
What is the Al₂O₃ content in sillimanite brick and why does it matter?
Sillimanite brick contains 50%–65% Al₂O₃ depending on the grade. A higher Al₂O₃ content directly improves resistance to corrosion by molten slag, glass liquid and chemical media, while also enhancing mechanical strength and high-temperature performance.
Q
In which industries is sillimanite brick most commonly used?
Sillimanite brick is widely used across the glass industry, iron and steel industry, ceramic industry, and chemical industry. It is applied in glass melting furnaces, blast furnaces, hot blast stoves, ceramic kilns, high-temperature reaction furnaces, and incinerators, among others.
Q
What is the difference between sillimanite brick and andalusite brick?
Both are high-alumina refractory materials, but sillimanite brick typically offers higher Al₂O₃ content (≥60% or ≥65%), lower apparent porosity (≤18–19%), higher cold crushing strength (≥80 MPa), and a higher refractoriness under load (≥1650℃) compared to andalusite brick, which generally has a lower Al₂O₃ content (≥53%) and lower performance thresholds.
Q
How does sillimanite brick maintain volume stability at high temperatures?
During heating, sillimanite undergoes a mullitization reaction that causes slight volume expansion. This expansion effectively offsets the shrinkage produced by liquid phase generation. Combined with its low high-temperature creep rate, sillimanite brick maintains excellent volume stability, preserving the structural integrity of kiln linings over long service periods.
Q
Can sillimanite brick withstand thermal shock in ceramic firing kilns?
Yes. Sillimanite brick is well-suited for ceramic firing kilns such as tunnel kilns and shuttle kilns, which involve frequent and significant temperature fluctuations. Its thermal shock resistance allows it to adapt to rapid temperature changes without cracking or structural damage, ensuring consistent and uniform heating of ceramic products.