Alumina ceramic is a ceramic material based on aluminum oxide (Al2O3) and 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 ceramic is a widely used ceramic. Because of its superior properties, its application in modern society has become more and more extensive, meeting the needs of daily use and performance.
Alumina ceramics are divided into two types: high purity type and ordinary type.
High-purity alumina ceramics are ceramic materials with an Al2O3 content of more than 99.9%. Since their sintering temperature is as high as 1650-1990℃ and the transmission wavelength is 1-6μm, they are generally Molten glass can be made to replace platinum crucibles; its light transmittance and resistance to alkali metal corrosion can be used as sodium lamp tubes; it can be used as integrated circuit substrates and high-frequency insulating materials 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 the Al2O3 content is 80% or 75%. Classified as ordinary alumina ceramic series. Among them, 99 alumina porcelain is used to make high-temperature crucibles, refractory furnace tubes and materials, such as ceramic bearings, ceramic seals and water valves; 95 alumina porcelain is mainly used for corrosion resistance and components; 85 porcelain is often mixed with Some talcs have improved electrical properties and mechanical strength, and can be sealed with molybdenum, niobium, tantalum and other metals, and some are used as electronic vacuum device components.
Alumina ceramic products are formed by dry pressing , grouting, extrusion, cold isostatic pressing, injection, casting, hot pressing and hot isostatic pressing molding and other methods. In recent years, molding technology methods such as filter press molding, direct solidification injection molding, gel injection molding, centrifugal grouting molding and solid free molding have been developed at home and abroad. Different product shapes, sizes, complex shapes and precision products require different molding methods.
1. High hardness
As measured by the Shanghai Ceramic Institute of the Chinese Academy of Sciences, its Rockwell hardness is HRA80-90, which is second only to diamond in hardness and far exceeds the performance of steel and stainless steel.
2. Excellent performance
As measured by the Powder Metallurgy Research Institute of Central South University, its performance is equivalent to 266 times that of manganese steel and 171.5 times that of high chromium cast iron. According to our customer tracking surveys over more than ten years, under the same working conditions, the service life of the equipment can be extended by at least ten times.
3. Light weight
Its density is 3.5g/cm3, which is only half that of steel, which can greatly reduce the load on equipment.
