Characteristics of alumina ceramics

Alumina ceramics are divided into two types: high purity type and ordinary type.

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℃, and the transmission wavelength is 1 to 6um, they are generally made into molten glass to replace platinum crucibles; use its light transmission It can be used as a sodium lamp tube, and can be used as an integrated circuit substrate and high-frequency insulating material in the electronics industry.

Ordinary alumina ceramics can be 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 porcelain is used to make high temperature crucibles, refractory furnace tubes and special materials, such as ceramic bearings, ceramic seals and water valve discs; 95 alumina porcelain is mainly used for corrosion resistance; 85 porcelain is often mixed with parts Talc improves electrical performance and mechanical strength, and can be sealed with metals such as molybdenum, niobium, and tantalum, and some are used as electrical vacuum devices.

1. High hardness

After testing, its Rockwell hardness is HRA80-90, which is second only to diamond.

2. Good wear resistance

After testing, its wear resistance is equivalent to 266 times that of manganese steel and 171.5 times that of high-chromium cast iron. According to our customer follow-up survey over the past ten years, the service life of the equipment can be prolonged at least ten times under the same working conditions.

3. Lightweight

Its density is 3.5g/cm3, only half that of steel, which can greatly reduce the equipment load.