Silicon Nitride (Si3N4)
Silicon nitride ceramics are characterised by a low thermal coefficient of expansion as well as high thermal conductivity and strength. In addition, silicon nitride exhibits remarkable strength and impact resistance when subjected to high temperatures. On the other hand, boron nitride ceramics are excellent engineering materials for high temperature conditions. These materials are distinguished by their high hardness, mechanical strength, wear resistance and excellent resistance to acid corrosion.
Characteristics
High mechanical resistance
Silicon nitride boasts high mechanical strength across a broad temperature range. Its exceptional strength and low density make it easy to handle compared to other conventional materials.
Chemical stability
Silicon nitride remains inert against molten metal even at high temperatures, guaranteeing a longer service life with little maintenance required.
Thermal shock resistance
Silicon nitride has exceptional thermal shock resistance. It is used for applications with high thermal severity and where there are demanding reliability requirements.
Applications
- In the aluminium die-casting industry, silicon nitride is used as a protection tube for a hot body and as a riser tube.
- In the photovoltaic industry, it finds applications in heat shields, exhaust hoods and heat shield.
- In the bearing industry, it is used as a precision ball or roller bearing.
- Additionally, it serves as mould support, melting furnace support, crucible grid, nozzle, insulating ring, among other applications.
