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High-Performance Silicon Nitride Bonded Silicon Carbide Brick from China Suppliers and Factory for Extreme Conditions
Core Advantages
Exceptional High-Temperature Stability
With a maximum service temperature of 1600℃ and refractoriness up to 1750℃, the silicon nitride bonded silicon carbide brick maintains structural integrity and stable performance under long-term high-temperature operation, without deformation or cracking even in extreme thermal environments.
Superior Wear & Corrosion Resistance
High-purity SiC aggregate (content ≥85%) and dense Si₃N₄ bonding phase form a robust structure, which can resist severe wear from high-speed airflow, dust, and molten media, as well as erosion from acidic, alkaline, and reducing atmospheres.
Excellent Thermal Shock Resistance
Low thermal expansion coefficient (3.5–4.5×10⁻⁶/℃) enables the brick to withstand frequent cold-heat cycles (1100℃ water quenching test ≥25 times) without peeling or damage, adapting to intermittent operation equipment.
High Structural Strength & Long Service Life
The unique Si₃N₄ bonding system enhances the brick's compressive strength (≥35MPa) and flexural strength (≥8MPa), making it not easy to break during installation and use. Its service life is 2–3 times longer than that of ordinary silicon carbide bricks.
Product Parameters
| Item | SiC Brick | Si₃N₄-SiC Brick | |
|---|---|---|---|
| SiC % | ≥88 | ≥80 | ≥72 |
| Si₃N₄ % | / | / | ≥18 |
| Bulk Density (g/cm³) | ≥2.60 | ≥2.58 | 2.60–2.70 |
| Apparent Porosity (%) | ≤17 | ≤18 | ≤16 |
| Thermal Conductivity (1200℃) w/(m·k) | 13.2 | 12 | / |
| Cold Crushing Strength (MPa) | ≥110 | ≥100 | ≥180 |
| Thermal Shock Stability (1100℃ cooling, times) | ≥50 | ≥40 | ≥30 |
| Refractoriness Under Load ℃ (0.2MPa, 0.6%) | 1700 | 1700 | / |
Detailed Application Scenarios
1
Metallurgical Industry
◎ Our silicon nitride bonded silicon carbide brick is widely used in blast furnace tuyere sleeves, hot blast stove linings, converter mouth linings, and continuous casting tundish nozzles. This high-temp wear-resistant refractory brick can withstand high-temperature airflow erosion and molten steel scouring, effectively prolonging the service life of key metallurgical equipment and reducing shutdown maintenance time. It is a reliable high-performance refractory solution for harsh metallurgical working conditions.
2
Ceramics & Building Materials Industry
◎ Suitable for ceramic tunnel kiln cars, roller kiln inner linings, glass furnace regenerator checker bricks, and cement rotary kiln tertiary air ducts, our silicon nitride bonded silicon carbide brick resists high-temperature wear and dust erosion. This refractory brick ensures uniform furnace temperature, improves the qualification rate of ceramic, glass, and cement products, and maintains stable performance in long-term high-temperature operation.
3
Petrochemical Industry
◎ Our silicon nitride bonded silicon carbide brick is applied to catalytic cracking reactor linings, reformer tubes, and high-temperature flue gas pipelines. As a corrosion-resistant refractory material, it can withstand the erosion of high-temperature, high-pressure, and corrosive media (such as sulfur-containing gas), ensuring the safe and continuous operation of petrochemical equipment and reducing maintenance costs.
4
Power Industry
◎ Used in circulating fluidized bed (CFB) boiler linings, boiler cyclone separators, and ash discharge pipes, our silicon nitride bonded silicon carbide brick excels in resisting the wear of high-speed fly ash and high-temperature flue gas. This high-temp refractory brick reduces boiler maintenance frequency, improves power generation efficiency, and is a cost-effective choice for power plants.
Conclusion
Contact us now for a quote and experience the difference of working with the best in the business.
Frequently Asked Questions
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Q What is the maximum service temperature of silicon nitride bonded silicon carbide brick?
The silicon nitride bonded silicon carbide brick has a maximum service temperature of 1600℃ and a refractoriness of up to 1750℃. It maintains structural integrity and stable performance even under prolonged high-temperature operation, making it suitable for the most demanding thermal environments.
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Q How does Si₃N₄-SiC brick compare to ordinary silicon carbide brick in terms of service life?
Thanks to its unique Si₃N₄ bonding system and superior compressive strength (≥35MPa) and flexural strength (≥8MPa), the silicon nitride bonded silicon carbide brick offers a service life 2–3 times longer than that of ordinary silicon carbide bricks, significantly reducing replacement frequency and maintenance costs.
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Q Is silicon nitride bonded silicon carbide brick suitable for use in corrosive chemical environments?
Yes. The dense Si₃N₄ bonding phase and high-purity SiC aggregate (≥85%) provide excellent resistance to acidic, alkaline, and reducing atmospheres. It is widely applied in petrochemical equipment such as catalytic cracking reactor linings and high-temperature flue gas pipelines exposed to sulfur-containing gases and other corrosive media.
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Q Can this refractory brick handle rapid temperature changes (thermal shock)?
Absolutely. With a low thermal expansion coefficient of 3.5–4.5×10⁻⁶/℃ and a thermal shock stability of ≥25 cycles (1100℃ water quenching test), the brick withstands frequent cold-heat cycles without peeling or cracking. It is ideal for intermittent operation equipment in industries such as ceramics and power generation.
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Q What industries are the primary application areas for Si₃N₄-SiC bricks?
Silicon nitride bonded silicon carbide bricks are widely used across multiple industries, including metallurgy (blast furnace tuyere sleeves, converter linings), ceramics and building materials (tunnel kiln cars, roller kiln linings), petrochemicals (reactor linings, reformer tubes), and power generation (CFB boiler linings, cyclone separators). Their versatility makes them a preferred refractory solution for high-temperature, high-wear environments.
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Q What is the cold crushing strength of Si₃N₄-SiC brick compared to standard SiC brick?
The Si₃N₄-SiC brick achieves a cold crushing strength of ≥180MPa, significantly higher than standard SiC bricks which typically reach ≥100–110MPa. This superior structural strength ensures the brick is less prone to breakage during installation and use, providing greater reliability in demanding industrial applications.