Alumina ceramic is a kind of ceramic material with alumina (Al2O3) as the main body, which is used in thick film integrated circuit. Alumina ceramics have good conductivity, mechanical strength and high temperature resistance. It should be noted that ultrasonic cleaning is required. Alumina ceramic is a kind of widely used ceramic. Because of its superior performance, it has been used more and more widely in modern society, meeting the needs of daily use and special performance.
       Alumina ceramics can be divided into high-purity type and common type.
High purity alumina ceramics with Al2O3 content of more than 99.9% are usually made into molten glass instead of platinum crucible due to their sintering temperature of 1650-1990 ℃ and transmission wavelength of 1-6 μ M. they can be used as sodium lamp tubes by their light transmittance and alkali resistance. They can be used as integrated circuit substrates and high-frequency insulation materials in the electronics industry.
       According to the content of Al2O3, ordinary alumina ceramics can be divided into 99, 95, 90 and 85 ceramics. Sometimes, alumina ceramics with Al2O3 content of 80% or 75% can also be classified as ordinary alumina ceramics. Among them, 99 alumina ceramic materials are used to make high temperature crucible, fire-resistant furnace tube and special wear-resistant materials, such as ceramic bearing, ceramic seal and water valve plate, etc.; 95 alumina ceramic is mainly used as corrosion-resistant and wear-resistant parts; 85 ceramics can be sealed with molybdenum, niobium, tantalum and other metals, and some of them can be used as electric vacuum devices.

The forming methods of alumina ceramic products include dry pressing, grouting, extrusion, cold isostatic pressing, injection, casting, hot pressing and hot isostatic pressing. In recent years, many molding technologies have been developed at home and abroad, such as pressure filtration molding, direct solidification molding, gel casting, centrifugal grouting molding and solid free molding. Different products with different shapes, sizes, complex shapes and precision need different forming methods.
       1. High hardness
According to the determination of Shanghai Silicate Research Institute, Chinese Academy of Sciences, its Rockwell hardness is hra80-90, which is next to diamond in hardness and far exceeds the wear resistance of wear-resistant steel and stainless steel.
       2. Excellent wear resistance
The wear resistance is 266 times that of manganese steel and 171.5 times that of high chromium cast iron. According to our more than ten years of customer tracking survey, under the same working condition, the service life of the equipment can be extended at least ten times.
       3. Light weight
Its density is 3.5g/cm3, only half of that of steel, which can greatly reduce the equipment load.