Author:Site Editor Publish Time: 18-08-2017 Origin:Site
Alumina ceramic is a kind of alumina (Al2O3) as the main body of ceramic materials for thick film integrated circuits. Alumina ceramics have good conductivity, mechanical strength and high temperature resistance. It is important to note that ultrasonic cleaning is required. Alumina ceramics is a widely used ceramic because of its superior performance, the application of modern society has become more and more widely, to meet the needs of daily and special performance. Alumina ceramic is divided into high purity and ordinary type two.
High purity alumina ceramic Al2O3 content of 99.9% or more of the ceramic material, because of its sintering temperature of up to 1650-1990 ℃, transmission wavelength of 1 ~ 6μm, generally made of molten glass to replace the platinum crucible; the use of its light And alkali-resistant metal corrosion for sodium lamp; in the electronics industry can be used as integrated circuit substrate and high-frequency insulation materials.
Ordinary alumina ceramic according to Al2O3 content is divided into 99 porcelain, 95 porcelain, 90 porcelain, 85 porcelain and other varieties, sometimes Al2O3 content of 80% or 75% were also classified as ordinary alumina ceramic series. 99 alumina ceramic is used for the production of high temperature crucible, refractory tube and special wear-resistant materials, such as ceramic bearings, ceramic seals and water valve, etc .; 95 alumina ceramic is mainly used for corrosion-resistant, wear parts; Due to the incorporation of some talc, improve the electrical properties and mechanical strength, with molybdenum, niobium, tantalum and other metal sealing, and some used as electrical vacuum device devices.
Alumina ceramic molding methods are dry pressure, grouting, extrusion, cold isostatic pressing, injection, casting, hot pressing and hot isostatic pressing and other methods. In recent years at home and abroad have developed a pressure filter forming, direct solidification injection molding, gel injection molding, centrifugal injection molding and solid free molding and other molding technology. Different product shapes, sizes, complex shapes and precision products require different molding methods.