Aluminum oxide and alumina ceramics have excellent wear characteristics, chemical resistance, compressive strength, high-temperature properties, and dielectric strength. Alumina or aluminum oxide is a compound of aluminum metal and oxygen used in the alpha alumina structural form. In its pure form, alumina is a white, high-hardness ceramic. Fully-dense alumina can be translucent. Aluminum oxide and alumina ceramics are used widely because of their high electrical insulation, high mechanical strength, high wear resistance, and good chemical resistance. Alumina’s main drawback, however, is its relatively poor thermal-shock resistance due its higher coefficients of thermal expansion and lower thermal conductivity compared to other pure ceramic materials.
Aluminum oxide and alumina ceramics are categorized by phase and grade. There are several phases of aluminum oxide, including a, c, h, d, k, q, g, and r. Similarly, there are many commercial grades of alumina. Examples include smelter-grade, calcined, low soda, reactive, tabular, fused, and high-purity. Smelter alumina is used in the manufacture of aluminum metal, typically in fluid bed or fluid flash calciners. Calcined alumina may use mineralizing catalysts and contain sodium oxide as the main impurity. Low soda alumina is used mainly in electrical and electronic components. Reactive alumina has a relatively high purity and small crystal size. Tabular alumina is re-crystallized or sintered alpha alumina. Fused alumina is made in electric arc furnaces. High-purity alumina is used in the manufacture of synthetic gem stones, laser components, and instrument windows. Other types of aluminum oxide and alumina ceramics are also available.
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Engineering Web: Aluminum Oxide and Alumina Ceramics
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Aluminium oxide - Wikipedia, the free encyclopedia (Redirected from Aluminum oxide) Jump to: navigation, search "Alumina" redirects here. For the company, see Alumina Limited. |
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Transparent aluminum - Wikipedia, the free encyclopedia Aluminum oxide, a chemical compound of aluminum and oxygen (Al2O3) is made transparent through a process of fusing fine particles.[1[2 Nanophase |
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NERSC web pages Aluminum oxide or alumina is one of the most promising ceramics for engines because of its hardness ? it is widely used for abrasives, like |
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