Classification of alumina ceramics
Alumina ceramics are currently divided into two types: high-purity and ordinary.
High-purity alumina ceramics are ceramic materials with Al2O3 content above 99.9%. Ordinary alumina ceramics are divided into 99 porcelain, 95 porcelain, 90 porcelain, and 85 porcelain according to the content of Al2O3. Sometimes the content of Al2O3 at 80% or 75% is also classified as ordinary alumina ceramics. Among them, 99 alumina porcelain is used to make high-temperature crucibles, refractory furnace tubes and special wear-resistant materials, such as ceramic bearings, ceramic seals and water valve discs; 95 alumina porcelain is mainly used as corrosion-resistant and wear-resistant parts.