Al2O3 Alumina ceramic

Al2O3 Alumina ceramic

What is alumina ceramic material?

Alumina ceramics are a kind of alumina (Al₂O) as the main body of the ceramic material, according to its alumina purity can be divided into high purity type and common type two, the use is also different.



High purity alumina ceramics refer to those in which the content of Al₂O₃ is more than 99.9%. Due to the sintering temperature of 1700℃ and transmission wavelength of 1 ~ 6μm, they are generally made into molten glass to replace the platinum crucible. Use its light transmission and alkali metal corrosion resistance as sodium lamp tube; It can be used as integrated circuit board and high frequency insulation material in the electronics industry.


The common alumina ceramics are divided into 99 porcelain, 95 porcelain, 93 porcelain, 92 porcelain, 85 porcelain and other varieties according to the content of Al₂O₃, which is mainly used in the field of industrial anti-wear. Among them, 99 alumina porcelain materials are used to make high temperature crucible, refractory furnace pipe and special wear-resistant materials, such as ceramic bearings, ceramic seals and water valves; 95 alumina porcelain is mainly used as corrosion resistance and wear resistance parts; The 85 porcelain is often mixed with talc to improve the electrical properties and mechanical strength, and can be sealed with molybdenum, niobium, tantalum and other metals, and some are used as electric vacuum devices.


Alumina ceramics are sintered by high-quality alumina powder, at 1700℃ high temperature, alumina will be converted into α alumina, forming a special crystal structure, not only hardness exceeds RHA85, second only to diamond, excellent wear resistance, far more than wear-resistant steel, cast stone cast iron and so on. And the chemical properties of αalumina are stable, can resist most acid and alkali corrosion, and its high temperature resistance is also very strong, aluminum oxide ceramic liner and aluminum oxide ceramic pipe are widely used in the field of industrial anti-wear.


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