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High-Performance Silicon Nitride Bonded Silicon Carbide Brick | China Suppliers & Factory for Refractory Solutions
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
What is the maximum service temperature of silicon nitride bonded silicon carbide brick?
Silicon nitride bonded silicon carbide brick has a maximum service temperature of 1600℃ and a refractoriness of up to 1750℃. This makes it highly suitable for extreme high-temperature industrial applications such as metallurgy, ceramics, and petrochemicals.
How does Si₃N₄-SiC brick compare to ordinary silicon carbide brick in terms of service life?
Thanks to the unique Si₃N₄ bonding system, silicon nitride bonded silicon carbide brick offers a service life 2–3 times longer than ordinary silicon carbide bricks. Its superior compressive strength (≥35MPa) and flexural strength (≥8MPa) contribute to this extended durability.
Is silicon nitride bonded silicon carbide brick resistant to chemical corrosion?
Yes. The dense Si₃N₄ bonding phase and high-purity SiC aggregate (≥85%) provide outstanding resistance to acidic, alkaline, and reducing atmospheres. It is also resistant to erosion from sulfur-containing gases and other corrosive media found in petrochemical environments.
How many thermal shock cycles can the Si₃N₄-SiC brick withstand?
The brick can withstand 1100℃ water quenching tests ≥25 times without peeling or structural damage. Its low thermal expansion coefficient (3.5–4.5×10⁻⁶/℃) ensures excellent thermal shock resistance, making it ideal for equipment with intermittent or fluctuating operating temperatures.
What industries are the primary applications for silicon nitride bonded silicon carbide brick?
This refractory brick is widely used across four main industries: metallurgy (blast furnaces, converters), ceramics & building materials (tunnel kilns, glass furnaces), petrochemicals (catalytic cracking reactors, reformer tubes), and power generation (CFB boilers, cyclone separators). It is valued for its wear resistance, corrosion resistance, and thermal stability.
What is the cold crushing strength of Si₃N₄-SiC brick compared to standard SiC brick?
Si₃N₄-SiC brick achieves a cold crushing strength of ≥180MPa, significantly higher than standard SiC bricks which range from ≥100MPa to ≥110MPa. This superior mechanical strength reduces the risk of breakage during installation and extends operational reliability in demanding industrial environments.