In order to make ceramics resistant to high temperatures and not easily broken, cermets have been made by adding some metal powder to the ceramic clay. Metal-based cermets are prepared by adding oxide fine powder to a metal matrix, also known as dispersion-enhancing materials. There are mainly sintered aluminum (aluminum-alumina), sintered tantalum (yttrium-yttria), TD nickel (nickel-yttria) and the like. A composite material consisting of one or more ceramic phases and a metal phase or alloy. Generalized cermets also include refractory compound alloys, cemented carbides, and metal bonded diamond tool materials. The ceramic phase in the cermet is an oxide or refractory compound having a high melting point and a high hardness, and the metal phase is mainly a transition element (iron, cobalt, nickel, chromium, tungsten, molybdenum, etc.) and an alloy thereof.
The cermet has the advantages of metal and ceramics. It has low density, high hardness, good wear resistance and good thermal conductivity, and will not be brittle due to quenching or sudden heat. In addition, coating a metal surface with a ceramic coating with good airtightness, high melting point and poor heat transfer properties can also prevent oxidation or corrosion of metals or alloys at high temperatures. The cermet has both metal toughness, high thermal conductivity and good thermal stability, as well as ceramics with high temperature resistance, corrosion resistance and wear resistance. Cermets are widely used in rockets, missiles, outer shells of supersonic aircraft, flame vents in combustion chambers, and the like.
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