In addition to single-phase ceramics composed primarily of one compound, there are also composite ceramics composed of two or more compounds. For example, magnesia-alumina spinel ceramics composed of alumina and magnesium oxide, silicon-aluminum oxynitride ceramics composed of silicon nitride and alumina, and chromium oxide, lanthanum oxide, and calcium oxide combined Lanthanum chromate ceramics, lead lanthanum zirconate titanate (PLZT) ceramics made of zirconium oxide, titanium oxide, lead oxide, lanthanum oxide and so on.
In addition, there is a large class of cermets produced by adding metals to ceramics, such as oxide-based cermets, carbide-based cermets, boride-based cermets, etc., which are also important varieties in modern ceramics. In order to improve the brittleness of ceramics, metal fibers and inorganic fibers are added to the ceramic matrix. The fiber-reinforced ceramic composite constituted by this is the youngest but most promising branch of the ceramic family.
For the convenience of production, research, and study, they are sometimes divided into high-strength ceramics, high-temperature ceramics, high-toughness ceramics, ferroelectric ceramics, piezoelectric ceramics, electrolyte ceramics, and semiconductor ceramics according to the properties of the ceramics. , Dielectric ceramics, optical ceramics (ie transparent ceramics), magnetic ceramics, acid-resistant ceramics and bioceramics, etc.
With the development of science and technology, one can expect that modern ceramics will develop faster and produce more new varieties.