Al2O3 is the main component of alumina ceramics. Ceramics containing more than 75% Al2O3 are usually called high alumina ceramics. 96 alumina ceramic is one of the most widely used ceramics in structural ceramics. Because of its excellent electrical performance at high frequency, it has small dielectric loss, large volume resistivity, high strength, high hardness, small linear expansion coefficient, and good wear resistance and heat resistance.