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What is special ceramics?

Number of visits: Date:2018-12-24 09:46
Special ceramics are specially formulated inorganic materials in ceramic blanks, which are sintered at high temperature to obtain stable and reliable antistatic properties. They become a new type of special ceramics, usually with one or more functions. Such as: electrical, magnetic, optical, thermal, acoustic, chemical, biological and other functions; and coupling functions, such as piezoelectric, thermoelectric, electro-optic, acousto-optic, magneto-optical and other functions.
According to the chemical composition of special ceramics can be divided into:
    1 Oxide ceramics: alumina, zirconia, magnesia, calcium oxide, cerium oxide, zinc oxide, cerium oxide, titanium oxide, cerium oxide, uranium oxide, and the like.
    2 nitride ceramics: silicon nitride, aluminum nitride, boron nitride, uranium nitride, and the like.
    3 carbide ceramics: silicon carbide, boron carbide, uranium carbide, etc.
    4 boride ceramics: zirconium boride, lanthanum boride, and the like.
    5 silicide ceramics: molybdenum silicide and the like.
    6 Fluoride ceramics: magnesium fluoride, calcium fluoride, barium fluoride, and the like.
    7 Sulfide ceramics: zinc sulfide, barium sulfide, and the like. There are also arsenide ceramics, selenide ceramics, and bismuth ceramics.
    In addition to single-phase ceramics mainly composed of one compound, there are composite ceramics composed of two or more compounds. For example, a magnesium aluminum spinel ceramic in which aluminum oxide and magnesium oxide are combined, a silicon oxynitride ceramic obtained by combining silicon nitride and aluminum oxide, or the like. In addition, there are a large number of cermets formed by adding a metal to a ceramic, such as an oxide-based cermet, a carbide-based cermet, or the like. In recent years, in order to improve the brittleness of ceramics, metal fibers and inorganic fibers have been added to the ceramic matrix. The fiber-reinforced ceramic composite material thus constituted is the youngest but most promising branch of the ceramic family.
    For the convenience of production, research and study, people sometimes do not according to chemical composition, but according to the properties of ceramics, they are divided into high-strength ceramics, high-temperature ceramics, high-toughness ceramics, wear-resistant ceramics, ferroelectric ceramics, piezoelectric ceramics, Electrolyte ceramics, semiconductor ceramics, dielectric ceramics, optical ceramics (ie transparent ceramics), magnetic porcelain, 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.

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