Si3N4 bonded SiC brick is made of high-purity silicon carbide with in-situ formed silicon nitride bond, featuring excellent thermal shock resistance, high strength, high thermal conductivity and oxidation resistance for blast furnace tuyeres, aluminum cell sidewalls and kiln furniture.
| Chemical composition SiC | ≥72% |
|---|---|
| Chemical composition Si₃N₄ | ≥18% |
| Bulk density | ≥2.65 g/cm³ |
| Apparent porosity | ≤16% |
| Cold crushing strength | ≥150 MPa |
| MOR (1400℃) | ≥40 MPa |
| Max. service temperature | 1500℃ |
Silicon nitride bonded silicon carbide brick (Si₃N₄-SiC brick) is made of high-purity silicon carbide (SiC) grains and fines as aggregate, with silicon nitride (Si₃N₄) formed in situ during nitriding firing to bond the SiC particles. The material combines the high thermal conductivity and wear resistance of SiC with the tough, strong nitride bond, making it one of the preferred materials for critical high-temperature applications.
Standard products serve long-term at 1400°C–1500°C, with special grades going higher; the actual limit depends on atmosphere and load.
Yes. We have full forming, nitriding firing and finishing capability for special shapes, composite bricks and kiln furniture, with small-batch production available.
Ordinary SiC brick is bonded with clay, oxides or resin and has weaker hot strength and oxidation resistance; the nitride bond significantly improves strength, thermal shock and oxidation resistance for longer, more reliable service.
Standard sizes take 15–25 days; special shapes take 25–40 days depending on drawing complexity.
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