Alumina ceramic parts are widely used in lighting appliances, electric heating appliances, petrochemicals, machinery, textiles, automobiles and other industries. What are the classification and characteristics of alumina ceramic parts?
Alumina ceramic parts are divided into high-purity type and ordinary type, also known as alumina ceramic parts.
The characteristics of these two types of alumina ceramic parts:
1. High-purity alumina ceramic parts are ceramic materials with Al2O3 content of more than 99.9%. Since their sintering temperature is as high as 1650-1990 °C, the transmission wavelength is 1-6 μm.
It is generally made of molten glass to replace platinum crucibles: it is used as a sodium lamp tube by its light transmittance and alkali metal corrosion resistance; it can be used as an integrated circuit substrate and a high-frequency insulating material in the electronics industry.
2. Ordinary alumina ceramic parts 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 parts 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 pieces. 95 alumina porcelain is mainly used as corrosion-resistant and wear-resistant parts; 85 porcelain is often mixed with part of talc, which improves electrical properties and mechanical strength, and can be sealed with molybdenum, niobium, tantalum and other metals, and some are used for electric vacuum device device.
Another point that must be paid attention to is: the temperature of this product is safe to use. Note that the temperature range of corundum quality is <1600ºC, and the temperature of high aluminum quality is less than 1400ºC.
