There is much room for discussion on the types of alumina ceramics.
Alumina ceramics are divided into two types: high purity and ordinary type.
High-purity alumina ceramic system $literal content of more than 99.9% of ceramic materials, because of its sintering temperature of up to 1650-1990 ℃, transmission wavelength of 1~6μm, generally made of molten glass to replace the platinum crucible, using its light transmittance and alkali-resistant metal corrosion as a sodium lamp; In the electronic industry can be used as integrated circuit substrates and high-frequency insulating materials.
The common type alumina ceramics is divided into 99 porcelain, 95 porcelain, 90 porcelain, 85 porcelain and other varieties according to $literal content, sometimes $literal content in 80% or 75% is also classified as ordinary alumina ceramic series. 99 Alumina ceramic material is used for making high-temperature crucible, refractory pipe and special wear-resisting material, such as ceramic bearings, ceramic seals and water valve plate, etc. 95 alumina porcelain is mainly used for corrosion resistance, wear-resisting parts, 85 porcelain because of the often doped part of talc, improve the electrical performance and mechanical strength, and molybdenum, niobium, tantalum and other metal sealing, Some are used as electrical vacuum device devices.
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