In order to make the ceramics resistant to high tempera […]
In order to make the ceramics resistant to high temperatures and not easily broken, people added metal powder to the ceramic clay to make cermets.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 hardnes.
and the metal phase is mainly a transition element iron, cobalt, nickel, chromium, tungsten, molybdenum and an alloy thereof. 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. According to the percentage of each constituent phase, the cermet is divided into two types: ceramic as matrix and metal as matrix.Ceramic-based cermets mainly include: 1 oxide-based cermet.
It is made of alumina, zirconia, magnesia, yttrium oxide, etc., and is compounded with tungsten, chromium or cobalt. It has high temperature resistance, chemical corrosion resistance, good thermal conductivity and high mechanical strength. It can be used as a missile nozzle. Bushings, metal crucibles and metal cutting tools. 2 carbide based cermet. It is made of titanium carbide, silicon carbide, tungsten carbide, etc., and is compounded with metals such as cobalt, nickel, chromium, tungsten and molybdenum. It has high hardness, high wear resistance and high temperature resistance. It is used in the manufacture of cutting tools.
High temperature bearings, seal rings, twisted die sets and turbine blades. 3 nitride based cermet. Based on titanium nitride, boron nitride, silicon nitride and tantalum nitride, it has superhardness, thermal shock resistance and good high temperature creep, and is less used.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, TD nickel and the like. The content of alumina in sintered aluminum is about 5% to 15%. Compared with alloy aluminum, it has high temperature strength, low density, easy processing, corrosion resistance and good thermal conductivity. Commonly used in the manufacture of aircraft and missile structural parts, engine pistons, chemical machinery parts and so on.
|cobalt chromium alloy|