Alumina powder is made of liquid aluminum hydroxide by extrusion solidification, which contains a variety of elements, and the content is high, the overall density is higher than the general aluminum powder. The surface of alumina powder is closer to the ideal surface than that of other metal powders, so it has good exhaust performance. The particle size of alumina powder is generally 90-100 microns, has good suspension, no load charge, can be oxidized at low temperatures, and has excellent electromagnetic characteristics.

Industrial alumina is prepared from bauxite (AlzOs-3H2O) and diaspore, and A1203, which requires high purity, is generally prepared by chemical methods. A1203 has a lot of homogenous crystals, there are more than 10 known, there are mainly 3 crystal types, namely A-Alzos, B-AlzOs, Y-AlzOs. Among them, different structures and properties are different, and it is almost completely converted into a-AlzO3 at high temperatures above 1300℃.

Calcium fluoride is an inorganic compound that is colorless crystal or white powder. Insoluble in water, slightly soluble in inorganic acid, react with hot concentrated sulfuric acid to produce hydrofluoric acid. In general, calcium fluoride is prepared by the interaction of calcium carbonate with hydrofluoric acid or by repeated treatment of fluorite powder with concentrated hydrochloric acid or hydrofluoric acid.

Mica is a rock-forming mineral with a hexagonal lamellar crystal shape. Characteristics are insulation, high temperature resistance, the most used in industry is sericite, widely used in paint, paint, electrical insulation and other industries.

Alumina, chemical formula Alz0s. It is a high-hardness compound with a melting point of 2054 ° C and a boiling point of 2980 ° C. It is an ionic l crystal that can be ionized at high temperatures and is often used in the manufacture of refractory materials.

Alumina and aluminum are two closely related materials that play important roles in modern indust

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