Among oxides with a melting point of more than 2000°C, alumina is the most flexible and cheap material. Alumina ceramics are the most widely used, most widely used, and most productive ceramic materials in oxide ceramics. There are 12 homogeneous polymorphs of Al2O3, but three of them are mainly used, namely α-Al2O3, β-Al2O3 and γ-Al2O3. These three crystals have different structures, so their properties are very different. difference.
α-Al2O3 is a trigonal crystal system with the tightest structure, low chemical activity, good high temperature stability, excellent electrical properties and the best mechanical properties.
β-Al2O3 is a polyaluminate mineral with a high content of Al2O3. Its chemical composition contains a certain amount of alkaline earth metal oxides and alkali metal oxides, and it can also exhibit ionic conductivity.
γ-Al2O3 is a spinel cubic structure. Instability at high temperature, poor mechanical and electrical properties. However, it has a higher specific surface area and strong chemical activity, and can be used as an adsorption material after technological improvement.

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Ceramic tube Thermocouple protection tube superalloy smelting tube		Ceramic rod Ceramic shaft sleeve insulated refractory rod ceramic shaft.
Ceramic crucible High quality and high temperature resistant crucible for metal smelting.		T-shaped concave convex tube High temperature insulator porcelain mouth porcelain sleeve porcelain eye porcelain bead
Ceramic plate Alumina plate, ceramic plate, bearing plate, insulating plate.		Ceramic gasket High temperature resistant ceramic ring, insulating washer.
Screw nut Insulating screws, corrosion-resistant bolts, heat-resistant screws.		Ceramic ball Alumina and zirconia ultrafine grinding media.