The first is the use of oxide ceramic materials alumina ceramics usually refers to ceramic materials with α -alumina as the main crystalline phase. Depending on the content of alumina, there are 75,85,90,95, and 99 porcelain brands. Mainly α -alumina crystalline ceramic material has high hardness and mechanical strength, good wear resistance, thermal conductivity, high electrical resistance and insulation resistance, small dielectric loss, stable electrical performance with the change of temperature and frequency, and convenient manufacturing, uniform surface level, is widely used as an electric insulation material. So far, more than ten Al2O3 crystal structures have been found, but there are three.
The other crystal phases are almost completely converted to α -Al2O3 at a temperature above 1300℃. Alumina ceramic materials due to the wide source, cheap price, good wear resistance, so the most widely used in the industry. The study shows that the impact wear and wear resistance of 95%Al2O3 ceramic material is more than 5 times that of high chromium cast iron (Cr15Mo3). For friction and wear, when the alumina content is low, the alumina content affects the wear resistance of aluminum oxide ceramics. With the increase of Al2O3 content, its wear resistance improves, and the effect is more significant in wet grinding.
The second is the use of zirconia ceramic materials The density of zirconia grinding medium is high (alumina ball about 3.6 g/cm3, zirconium ball about 6.0 g/cm3), the strength and toughness is very high, so it has excellent wear resistance and very high grinding efficiency, and can prevent material pollution, especially suitable for wet grinding and dispersion, has been widely used in ceramics, magnetic materials, coatings, ink, medicine and food and other industrial fields. For example: advanced car paint, mobile phone paint, inkjet ink, senior cosmetics, etc. With its high proportion of zirconia grinding beads (alumina ball proportion about 3.6 g/cm3, zirconia ball proportion about 6.0 g/cm3), large toughness, excellent wear resistance, has gradually become the most widely used grinding medium on the market.
The third is the use of zirconia alumina aluminum compound phase ceramics alumina porcelain ball is widely used because of its high hardness, stable chemical properties and suitable price; zirconium grinding ball is also used by many markets because of its significant ratio and good toughness, but the brittle problem of Al2O3 ceramics seriously hinders the application and development of alumina ceramics. In recent years, researchers have tried to improve the mechanical properties of alumina ceramics by adding a second phase. Alumina hardness, zirconia toughness. The two materials form excellent composite materials with high strength and high toughness, which are more widely used. The ZTA ceramics have high bending strength and fracture toughness at room temperature, so the zirconium oxide toughened ceramics have excellent wear resistance.
This composite ceramic material not only shows the characteristics of high toughness and high strength of zirconia ceramics, but also retains the advantages of high hardness of alumina ceramics, and with the improvement of this comprehensive mechanical properties, its wear resistance has also been greatly improved, the specific ratio of the two materials can be adjusted according to the actual use requirements of users. Zirconium toughened aluminum oxide ceramics performance is better than 99 aluminum oxide ceramics, the price is less than zirconia ceramics. Zirconium aluminum ceramics