How Many Oxide Structural Ceramics Do You Know? (1)
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Oxide structural ceramic is a kind of ceramic material that is widely used and earlier developed, which generally refers to various simple oxide ceramics with a melting point higher than that of SiO2 crystal (1730 ℃). Since used in the mobile phone back cover, zirconia ceramics are known to us. But how many commonly used oxide structural ceramics do you know besides zirconia?
Alumina ceramics is a kind of ceramic material mainly composed of alpha-al2o3 crystal, which is one of the most widely used ceramics currently.
Applications: Mechanical industry: the alumina ceramics used as cutting metal ceramic cutter, wire drawing die, ball bearings, grinding media and all kinds of wear-resistant porcelain; Electronic industry: used as ceramic substrates, vacuum switch ceramic shell, insulating ceramics for vacuum electronic devices, etc.; Semiconductor manufacturing: used as silicon wafer chuck, hook; the environment of high-temperature heating elements, such as the crucible, thermocouple protection tube, furnace tube, etc.; Paper industry: the wiper plate, desander, etc; Chemical industry, light industry, and textile: fire pump, mechanical washer, nozzle, wear-resisting liner, liner board, water valve, etc.; Medical areas: artificial joint, etc.
Beryllium Oxide Ceramics
Beryllium oxide ceramic is a kind of ceramic material mainly composed of beryllium oxide, which is a clear hexagonal structured crystal with stable density and without crystal shapeshift. The melting temperature of beryllium oxide ranges 2530 ~ 2570 ℃, the density of which is 3. 3 g/cm3 and Mohs hardness is 9, besides that, it has a high-temperature vapor pressure and low evaporation rate.
Applications: Electronics industry: Beryllium oxide ceramic is used as the high-power cooling device, electric vacuum components, hybrid integrated circuits, high power semiconductor devices; Metallurgical industry: used as the beryllium crucible and containers for smelting rare metals and high-purity metal like platinum, vanadium, etc; The nuclear industry: used as nuclear reactor structure under normal and high temperatures, including the neutron moderator, radiation protection materials, the control rods, and UO2 ceramic combined into nuclear fuel; Beryllium oxide ceramic also used to make transparent BeO ceramics serves as a storage device for microwave substrates and integrated circuit boards, also, applied to the instrument of the high-temperature observation window.
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