Alumina ceramic category

Alumina ceramic category

There is still much room for exploration regarding the categories of alumina ceramics. There are two types of alumina ceramics: high-purity and ordinary.

High purity alumina ceramics are ceramic materials with an Al2O3 content of over 99.9%, due to their high sintering temperature of 1650&flash; At 1990 ℃, the transmission wavelength is 1-6-mu; m. Generally, molten glass is made to replace platinum crucibles; its transparency and resistance to alkali metal corrosion are used as sodium lamp tubes; and it can be used as integrated circuit substrates and high-frequency insulation materials in the electronic industry.

The ordinary alumina ceramic series is divided into 99 porcelain, 95 porcelain, 90 porcelain, 85 porcelain and other varieties according to the different Al2O3 content. Sometimes, those with an Al2O3 content of 80% or 75% are also classified as the ordinary alumina ceramic series.

Among them, 99 alumina ceramic materials are used for making high-temperature crucibles, refractory furnace tubes, and special wear-resistant materials, such as ceramic bearings, ceramic seals, and water valve plates;

95 alumina porcelain is mainly used as corrosion-resistant and wear-resistant components;

Due to the frequent incorporation of some talc into 85 ceramics, their electrical properties and mechanical strength are improved. They can be sealed with metals such as molybdenum, niobium, and tantalum, and some are used as vacuum devices.

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