Alumina Ceramic Material

Alumina ceramics is a ceramic material mainly composed of Al2O3, which can be divided into high-purity type and ordinary type. High-purity alumina ceramics are ceramic materials with an Al2O3 content of more than 99.9%. Because its sintering temperature is as high as 1650-1990 °C and the transmission wavelength is 1-6 μm, it can be used as an integrated circuit substrate and high-frequency insulating material in the electronics industry. Ordinary alumina ceramics are divided into 99 porcelain, 95 porcelain, 90 porcelain, 85 porcelain and other varieties according to the Al2O3 content. Sometimes those with Al2O3 content of 80% or 75% are also classified as ordinary alumina ceramic series. Among them, 99 alumina porcelain materials are used to make high-temperature crucibles, refractory furnace tubes and special wear-resistant materials, such as ceramic bearings, ceramic seals and water valve plates, etc.; 95 alumina porcelain is mainly used as corrosion-resistant and wear-resistant parts; 85 porcelain is often mixed with some talc, which improves the electrical properties and mechanical strength, and can be sealed with molybdenum, niobium, tantalum and other metals, and some are used for electric vacuum Devices.