Alumina, or aluminum oxide Al2O3, has very high melting point and hard material, which is 2,072 °C . Alumina ceramics is a ceramic material with alumina (Al2O3) as the main element. Alumina ceramics have good acid and alkali corrosion resistance, good thermal conductivity, mechanical strength, wear resistance and high temperature resistance. It is a kind of ceramics with a wide range of application per to its superior performance, it has been widely used in modern society and meets the needs of daily use and special properties.