Silicon nitride bonded silicon carbide
Nitrogen-bonded silicon carbide is produced by firing mixtures of high-purity silicon carbide and silicon, or a mineral additive in a nitrogen atmosphere, at high temperature. The silicon carbide is bonded by the silicon nitride phase formed during nitriding. The highest operating temperature of the ensuing material is about 1750 ºC.
The properties of Nitrogen Bonded Silicon Carbide are suitable for many adverse service conditions:
- High-mechanical strength is sustained up to 1650*C, surpassing the service temperature of typical metals and refractories.
- It is rubust under compressice loading
- Good chemical resistance specifically to most molten salts, acids nd halogends. It may be attached by oxidizing agents and strong bases like sodium hydroxide and iron oxide.
- Thermal shock resistance owing a low thermal expansion coefficient, high temperature strength and high thermal conductivity.
- NBSC resists wetting through non-ferrous metals
- Good wear resistance in abrasive settings
- NBSC acts as a semiconductor at high temperatures.