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High-Performance Silicon Nitride Bonded Silicon Carbide Brick from China Suppliers & Factory - Durable Refractory Solution
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 (Grade A) | SiC Brick (Grade B) | 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 (FAQ)
Q
What is the maximum service temperature of silicon nitride bonded silicon carbide bricks?
Silicon nitride bonded silicon carbide bricks have a maximum service temperature of 1600℃ and a refractoriness of up to 1750℃, making them suitable for extreme high-temperature industrial environments such as metallurgical furnaces, kilns, and petrochemical reactors.
Q
How does the Si₃N₄-SiC brick compare to ordinary SiC bricks in terms of strength?
The Si₃N₄-SiC brick offers a cold crushing strength of ≥180MPa, significantly higher than ordinary SiC bricks (≥100–110MPa). Its service life is 2–3 times longer, thanks to the unique silicon nitride bonding system that enhances both compressive and flexural strength.
Q
Which industries are silicon nitride bonded silicon carbide bricks most suitable for?
These bricks are widely used in 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 boiler linings, cyclone separators).
Q
How many thermal shock cycles can Si₃N₄-SiC bricks withstand?
Silicon nitride bonded silicon carbide bricks can withstand ≥25 thermal shock cycles at 1100℃ water quenching conditions without peeling or cracking. Their low thermal expansion coefficient (3.5–4.5×10⁻⁶/℃) ensures reliable performance in equipment with intermittent or cyclical operation.
Q
Can silicon nitride bonded silicon carbide bricks resist chemical corrosion?
Yes. The dense Si₃N₄ bonding phase and high-purity SiC aggregate (≥85%) provide excellent resistance to acidic, alkaline, and reducing atmospheres, as well as corrosive media such as sulfur-containing gases. This makes them highly effective in petrochemical and power plant environments.
Q
What are the key differences between SiC bricks and Si₃N₄-SiC bricks?
Standard SiC bricks offer higher SiC content (≥88%) and better thermal conductivity (13.2 W/m·k at 1200℃), while Si₃N₄-SiC bricks feature a Si₃N₄ bonding phase (≥18%) that significantly boosts cold crushing strength (≥180MPa), reduces apparent porosity (≤16%), and improves resistance to corrosion and thermal shock — making them ideal for the most demanding applications.