Types of alumina ceramics:

12-03-2020

 Types of alumina ceramics:

Alumina Ceramic

Alumina ceramicsare divided into two types: high-purity and ordinary.

High-purity alumina ceramics are ceramic materials with an Al2O3 content of more than 99.9%. Because their sintering temperature is as high as 1650-1990 ° C and transmission wavelength is 1 to 6 μm, molten glass is generally made to replace platinum crucibles; they are used to transmit light. Properties and resistance to alkali metal corrosion used as sodium lamps; in the electronics industry can be used as integrated circuit substrates and high-frequency insulation materials.


Ordinary alumina ceramics are divided into 99 porcelain, 95 porcelain, 90 porcelain, 85 porcelain and other varieties according to different Al2O3 content. Sometimes those with Al2O3 content of 80% or 75% are also classified as ordinary alumina ceramic series. Among them, 99 alumina ceramicmaterialsare 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; 85 porcelain Because it is often mixed with talc, it improves the electrical performance and mechanical strength. It can be sealed with metals such as molybdenum, niobium, and tantalum. Some are used as electrical vacuum devices.

 

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