A cermet is a composite material consisting of ceramic (cer) and metallic (met) materials. The ceramic in general has high temperature resistance and hardness, and the metal has the ability to undergo plastic deformation. A cermet is ideally designed to have the combined optimal properties of a ceramic and a metal.
Cermet has the advantages of metal and ceramics. It has low density, high hardness, wear resistance, good thermal conductivity, and will not be brittle due to sudden cold or sudden heat. In addition, coating a layer of ceramic coating with good air tightness, high melting point and poor heat transfer performance on the metal surface can also prevent the metal or alloy from oxidizing or corroding at high temperatures. Cermet not only has the toughness, high thermal conductivity and good thermal stability of metal, but also has the characteristics of high temperature resistance, corrosion resistance and wear resistance of ceramics. Cermets are widely used in rockets, missiles, supersonic aircraft shells, and flame nozzles in combustion chambers.
