Alumina ceramic is a ceramic material with alumina (al2o3) as the main body for thick film integrated circuits. Alumina ceramics have good conductivity, mechanical strength and high temperature resistance. It is important to note that ultrasonic washing is required. Alumina ceramic is a widely used ceramic, because of its superior properties, the application in modern society has become more and more extensive, to meet the needs of daily use and special properties. Alumina ceramics are classified into two types: high purity and common

The high purity alumina ceramic is a ceramic material with a content of more than 99.9% which is generally made into molten glass instead of platinum crucible because its sintering temperature is as high as 1650- 1990°C and the transmission wavelength is 1-6μm.

The common type alumina ceramic system is divided into 99 porcelain,95 porcelain,90 porcelain,85 porcelain and so on according to the Al2O3 content, sometimes the Al2O3 content is 80% or 75% also classified as the ordinary alumina ceramic series. Among them,99 alumina porcelain materials are used to make high temperature crucible, refractory furnace tube and special wear-resistant materials, such as ceramic bearings, ceramic seals and water valves;95 alumina porcelain is mainly used as corrosion-resistant and wear-resistant parts;85 porcelain is often mixed with some talc, which improves electrical properties and mechanical strength, and can be sealed with molybdenum, niobium, tantalum and other metals, some of which can be used as electrical vacuum device devices