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High-Performance Silicon Nitride Bonded Silicon Carbide Brick from China Suppliers & Factory for Industrial Applications
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 silicon nitride bonded silicon carbide brick?
Silicon nitride bonded silicon carbide (Si₃N₄-SiC) brick is a high-performance refractory material made from high-purity silicon carbide aggregate bonded by a dense silicon nitride (Si₃N₄) phase. It combines exceptional high-temperature stability, wear resistance, and thermal shock resistance, making it ideal for demanding industrial applications.
What is the maximum service temperature of Si₃N₄-SiC brick?
The maximum service temperature of our silicon nitride bonded silicon carbide brick is 1600℃, with a refractoriness of up to 1750℃. It maintains structural integrity and stable performance even under prolonged exposure to extreme thermal environments.
How does Si₃N₄-SiC brick compare to ordinary silicon carbide bricks?
Compared to ordinary silicon carbide bricks, Si₃N₄-SiC brick offers significantly higher cold crushing strength (≥180MPa vs. ≥100MPa), lower apparent porosity (≤16%), and superior corrosion resistance. Its service life is 2–3 times longer, resulting in lower overall maintenance costs.
Which industries can benefit from silicon nitride bonded silicon carbide bricks?
These bricks are widely used across the metallurgical industry (blast furnaces, converters), ceramics and building materials industry (tunnel kilns, glass furnaces), petrochemical industry (catalytic cracking reactors, reformer tubes), and the power industry (CFB boilers, cyclone separators).
How many thermal shock cycles can Si₃N₄-SiC brick withstand?
Our silicon nitride bonded silicon carbide brick can withstand ≥25 water quenching cycles at 1100℃ without peeling or cracking. Its low thermal expansion coefficient (3.5–4.5×10⁻⁶/℃) ensures reliable performance in equipment that undergoes frequent temperature fluctuations.
Can Si₃N₄-SiC bricks be customized to specific dimensions or requirements?
Yes. We offer customized silicon nitride bonded silicon carbide bricks tailored to specific dimensions, shapes, and performance requirements. Please contact our team with your project details, and we will provide a professional solution and accurate quotation.