A new high temperature material Si(B)CN

Amorphous silicon carbonitride (SiCN) and boron-containing silicon carbonitride (SiBCN) have better high temperature properties than silicon carbide (SiC) and silicon nitride (Si₃N₄). The glass transition temperature (T_g) of SiCN is above 1400°C, and start to decompose to polycrystalline of SiC and Si₃N₄. The SiBCN material remains amorphous at temperature up to 1700°C and begin to crystallize above 1800°C SiCN and SiBCN have an excellent resistance to oxidation at 1600°C- According to the needs of high temperature materials, we discuss the thermal stability, oxidation resistance, and resistance to creep of those materials, respectively. Prospect the development of SiCN and SiBCN as high temperature ceramic materials.