Classification of alumina ceramics

Alumina ceramics is a ceramic material with alumina (Al2O3) as the main body, which is used in thick film integrated circuits. Alumina ceramics have good conductivity, mechanical strength and high temperature resistance. It should be noted that ultrasonic cleaning is required. Alumina ceramics is a kind of ceramics with a wide range of uses. Because of its superior performance, it has been widely used in modern society and meets the needs of daily use and special properties.

Alumina ceramics can be divided into two types: high-purity type and ordinary type.

High Purity Alumina Ceramics

High-purity alumina ceramics are ceramic materials with Al2O3 content of more than 99.9%. Because their sintering temperature is as high as 1650-1990 °C and transmission wavelength is 1~6 μm, they are generally made of molten glass to replace platinum crucibles; It is resistant to alkali metal corrosion and can be used as a sodium lamp; in the electronics industry, it can be used as an integrated circuit substrate and a high-frequency insulating material.

Ordinary alumina ceramics

Ordinary alumina ceramics are divided into 99 porcelain, 95 porcelain, 90 porcelain, 85 porcelain and other varieties according to the content of Al2O3. Sometimes those with Al2O3 content of 80% or 75% are also classified as ordinary alumina ceramic series. Among them, 99 alumina ceramic 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; 95 alumina ceramics are mainly used for corrosion-resistant and wear-resistant parts; 85 ceramics Because part of talc is often mixed into it, the electrical properties and mechanical strength are improved, and it can be sealed with metals such as molybdenum, niobium, and tantalum, and some are used as electric vacuum devices.