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High-Performance Silicon Mullite Brick for Cement Industry | China Suppliers & Factory Direct Quality
Core Advantages
Excellent High-Temperature Performance
The refractoriness is above 1790℃, and the starting temperature of load softening under 0.2MPa is up to 1650℃, which can withstand the high-temperature environment of industrial kilns for a long time without deformation or damage. It is especially suitable for the transition zone and decomposition zone of cement kilns with frequent temperature fluctuations.
Superior Wear & Erosion Resistance
The main crystal phases are corundum, silicon carbide and mullite with high hardness (Mohs hardness up to 9.5), and the product structure is dense. The room-temperature wear resistance is ≤7.8 cm², which can effectively resist the friction and erosion of high-temperature materials and corrosive gases, reducing the loss of kiln linings.
Outstanding Thermal Shock Stability
Thanks to the low thermal expansion coefficient of silicon carbide, the silicon mullite brick has excellent thermal shock resistance. After 15 times of water cooling tests at 1000℃, it still remains intact without cracking or spalling, adapting to the rapid temperature changes in kilns.
Good Thermal Insulation Effect
The thermal conductivity at 1000℃ is ≤1.7 W/(m·k), which is lower than that of alkaline products. It can effectively reduce the surface temperature of the kiln cylinder (lower by more than 50℃ compared with magnesia-aluminum spinel bricks), reduce energy loss and protect the kiln cylinder.
Product Parameters
| Item | Silica Mullite Brick | ||
| SM-1650 | SM-1680 | SM-1680T | |
| Al₂O₃ % | ≥65 | ≥65 | ≥68 |
| SiO₂+SiC % | ≥30 | ≥30 | ≥30 |
| Apparent Porosity % | ≤20 | ≤18 | ≤17 |
| Bulk Density g/cm³ | ≥2.65 | ≥2.65 | ≥2.70 |
| Cold Crushing Strength MPa | ≥95 | ≥90 | ≥90 |
| Refractoriness Under Load ℃ (0.2MPa, 0.6%) | ≥1650 | ≥1680 | ≥1680 |
| Thermal Shock Stability (1100℃ cooling) times | ≥10 | ≥12 | ≥15 |
| Thermal Conductivity (1000℃) W/(m·k) | ≤2.3 | ≤2.0 | ≤1.7 |
Detailed Application Scenarios
1
Cement Industry (Core Application Field)
As the largest application field of silicon mullite brick, it accounts for more than 38% of the global demand. It is mainly used in key parts of new dry process cement kilns, including the transition zone, decomposition zone, cooling machine and kiln mouth. The transition zone of cement kilns has no kiln skin protection, and is subjected to high temperature (up to 1400℃), material friction and alkaline erosion. Silicon mullite brick can form a continuous SiO₂ dense layer on the surface, which effectively prevents the penetration of molten substances and has excellent corrosion resistance.
2
Metallurgical Industry
It is widely used in ironmaking, steelmaking and non-ferrous metal smelting fields, accounting for about 28% of the market demand. In electric arc furnaces, converter linings, ladles and other equipment, silicon mullite brick can withstand high temperature and strong corrosion of molten metal and slag. Especially with the increase of electric furnace steelmaking ratio, the demand for high-wear and long-life refractory materials is increasing. The high hardness and wear resistance of silicon mullite brick can effectively resist the scouring of molten steel and slag, and its good thermal shock stability can adapt to the rapid temperature rise and fall during smelting, ensuring the safe and stable operation of smelting equipment.
3
Lime Kiln Industry
Lime production process will generate high temperature and strong alkaline substances, which have strong corrosion to kiln linings. Silicon mullite brick has excellent alkali corrosion resistance and thermal shock stability, which can maintain the integrity of the kiln lining structure in the harsh environment of lime kilns. It is mainly used as the inner lining of lime kilns, which can reduce the cracking and spalling of the lining caused by temperature changes and chemical corrosion, and extend the service life of the lime kiln. It is suitable for various types of lime kilns such as shaft kilns and rotary kilns.
4
Power Industry
With the development of new environmental protection power generation methods such as waste incineration and biomass power generation, the furnace environment is more complex and harsh, which provides a new market for silicon mullite brick. It is used in the furnace linings of waste incinerators, biomass boilers and thermal power plant boilers. It can resist the corrosion of harmful gases and high-temperature ash generated during combustion, and has good wear resistance and thermal shock stability. It can ensure the long-term stable operation of power generation equipment and reduce the maintenance cost of power plants.
Conclusion
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Frequently Asked Questions
Q
What is silicon mullite brick and what are its main components?
Silicon mullite brick is a high-performance refractory material whose main crystal phases are corundum, silicon carbide (SiC), and mullite. It typically contains ≥65% Al₂O₃ and ≥30% SiO₂+SiC, combining the high hardness of silicon carbide with the excellent high-temperature stability of mullite and corundum. This unique composition delivers outstanding wear resistance, thermal shock stability, and refractoriness above 1790℃.
Q
What is the maximum operating temperature of silicon mullite brick?
Silicon mullite brick has a refractoriness above 1790℃. Under a load of 0.2MPa, the softening starting temperature reaches up to 1650℃ (SM-1650 grade) or 1680℃ (SM-1680 / SM-1680T grades). This makes it highly suitable for sustained use in high-temperature industrial kiln environments such as cement kilns, lime kilns, and metallurgical furnaces.
Q
How does silicon mullite brick compare to magnesia-aluminum spinel brick in terms of thermal insulation?
Silicon mullite brick offers significantly better thermal insulation than magnesia-aluminum spinel brick. At 1000℃, its thermal conductivity is ≤1.7 W/(m·k) for the SM-1680T grade, which is lower than that of typical alkaline products. In practical applications, this can reduce the kiln cylinder surface temperature by more than 50℃ compared to magnesia-aluminum spinel bricks, resulting in lower energy consumption and better protection of the kiln shell.
Q
In which industries is silicon mullite brick most commonly used?
Silicon mullite brick is widely used across multiple high-temperature industries. The cement industry is the largest application field, accounting for over 38% of global demand, primarily in the transition zone, decomposition zone, cooling machine, and kiln mouth of new dry process cement kilns. It is also extensively used in metallurgical industries (electric arc furnaces, converters, ladles), lime kilns (shaft kilns and rotary kilns), and the power industry (waste incinerators, biomass boilers, and thermal power plant boilers).
Q
What are the differences between SM-1650, SM-1680, and SM-1680T grades?
The three grades differ primarily in performance levels. SM-1650 offers a refractoriness under load of ≥1650℃ with thermal shock stability of ≥10 times and thermal conductivity of ≤2.3 W/(m·k). SM-1680 improves on this with ≥1680℃ load softening temperature, ≥12 thermal shock cycles, and ≤2.0 W/(m·k) conductivity. SM-1680T is the premium grade, featuring the highest Al₂O₃ content (≥68%), lowest apparent porosity (≤17%), highest bulk density (≥2.70 g/cm³), best thermal shock stability (≥15 times), and lowest thermal conductivity (≤1.7 W/(m·k)), making it ideal for the most demanding kiln environments.
Q
How does silicon mullite brick resist chemical corrosion in cement and lime kilns?
Silicon mullite brick resists chemical corrosion through a self-protective mechanism: at high temperatures, it forms a continuous and dense SiO₂ protective layer on its surface. This layer acts as a barrier that effectively prevents the penetration of molten alkaline substances, corrosive gases, and liquid slag into the brick body. This property is especially valuable in cement kiln transition zones and lime kilns, where strong alkaline environments and chemical erosion are constant challenges, significantly extending the service life of the kiln lining.