Alumina ceramic arm:

Among oxides with a melting point of more than 2000°C, alumina is the most flexible and cheap material. Alumina ceramics is the ceramic material with the widest application, the widest application and the largest output among the oxide ceramics. There are 12 homogeneous polymorphs of Al2O3, but three of them are used more frequently, 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 has a spinel cubic structure. Instability at high temperatures, poor mechanical and electrical properties. But it has a higher specific surface area and strong chemical activity, and can be used as an adsorption material after technical improvement.