The density of zirconia grinding media is high (the specific gravity of alumina ball is about 3.6g/cm3, the specific gravity of zirconia ball is about 6.0g/cm3), and the strength and toughness are high, so it has excellent wear resistance and very high grinding efficiency, and It can prevent material pollution and is especially suitable for wet grinding and dispersing. For example: advanced car paint, mobile phone paint, inkjet ink, advanced cosmetics, etc. Zirconia grinding beads have gradually become the most widely used grinding beads on the market due to their high specific gravity (the specific gravity of alumina balls is about 3.6g/cm3, the specific gravity of zirconia balls is about 6.0g/cm3), high toughness and excellent wear resistance. medium.
In powder engineering, in addition to being used as a grinding medium, another important application of zirconia is as an accessory of a sand mill. Everyone is familiar with sand mills, and its task is to grind.
An excellent sand mill needs to have the advantages of high grinding efficiency, stable equipment performance and high product quality. In order to ensure these advantages, it is necessary to put forward requirements for its accessories: 1. It has wear-resistant properties, that is, the wear rate during grinding is low, and it will not cause serious pollution to the grinding products; 2. The hardness is large enough to ensure the high efficiency of grinding. Among the ceramic parts, zirconia is currently the most widely used and the most mature ceramic parts used in sand mills.
Among the four major diamond materials with relatively mature technology at present, zirconia, alumina, silicon carbide and silicon nitride, zirconia has the best toughness. Because of the high-speed rotation process, the contact grinding between the rotor and the material can easily lead to cracks in the ceramic parts, which will cause the ceramic parts to break over time. Only zirconia ceramics can meet the toughness of this special working condition. The application of the rotor meets the preparation and application requirements of many high-purity ultra-fine powders without ferromagnetic pollution.
