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Coating grade superfine three oxidation of two aluminum powder in China
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Alumina is a high hardness compound with a melting point of 2054 DEG C and a boiling point of about 2980 DEG C. Industrial Al2O3 is composed of bauxite (Al2O3 after 3H2O) and diaspore preparation, for the requirement of high purity Al2O3, general chemical preparation method.
Al2O3 has many polymorphs, currently known to have more than 10 kinds, mainly has 3 kinds of crystal form, namely gamma -Al2O3, beta -Al2O3, alpha -Al2O3 (Gang Yu). The structure of different properties are different, at temperatures above 1300 degrees Celsius almost completely converted to alpha -Al2O3
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The 1 main components of ruby and sapphire are alumina, because other impurities in different colors, sapphire is containing iron oxide and titanium oxide and blue.
2 in the aluminum ore main component bauxite, alumina content is the highest. The industry, iron were purified by Bayer process alumina alumina, and then changed from Hall-Heroult process for aluminum metal.
3 aluminum reacts with oxygen in air to produce a dense aluminum oxide film covering the surface of aluminum exposed to air.
4 aluminum is a good conductor of electricity and heat. Alumina crystal morphology because of high hardness, suitable for grinding materials and cutting tools.
5 medium alumina powder is used as layer analysis
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