The effect of wear-resistant ceramics is mainly reflected in the wear resistance of ceramic materials. To obtain Al2O3 ceramic material with high wear resistance, it is necessary not only to make it have high density, flexural strength, and compressive strength but also to improve its hardness and fracture toughness, which is consistent with the microstructure of Al2O3 ceramics (pore closure, grain size, glass distribution state, etc.) and its wear mechanism are closely related.
During the preparation process, various process conditions of alumina ceramics have a great influence on its sintering and microstructure. These techniques include the powder preparation process, particle size distribution, molding method, billet density, sintering temperature, heating rate, holding time, atmospheric heating, pressure, etc. Control the three main factors affecting the performance of wear-resistant ceramics, namely better alumina raw materials and their grinding grades, preparation methods of high-density green bodies, reasonable combustion temperature and holding time, so that the comprehensive performance of the produced wear-resistant ceramics is excellent, The microstructural display is also very beneficial for wear resistance.
High-purity Al2O3 powder is an important raw material for wear-resistant ceramics, and its properties and content have a great influence on alumina ceramics. During the preparation of ceramic powder, impurities are inevitably introduced, organic impurities are burned during the sintering process, and irregular pores appear during the densification process; inorganic impurities may react with the ceramic powder at high temperature, or leave microcracks in the matrix. These microstructural defects caused by impurities seriously affect the compactness of alumina ceramics. High-purity Al2O3 powder is an important prerequisite for the preparation of alumina ceramics with excellent properties.
Wear-resistant ceramics are wear-resistant ceramic powders purified from industrial sintered powders through multiple processes. According to product requirements, formula mixing, molding, sintering, and other processes. The wear-resistant ceramics produced by this method have good performance, but due to the long process, the production cost is high. To save costs, minerals such as kaolin are also used directly as the main raw material on the market, with a small amount of sintered alumina added. At present, the existing alumina ceramic waste is used as the main raw material. The alumina ceramics that form the α phase cannot organically combine with the surrounding molecules, resulting in poor compact wear resistance. Therefore, there is a huge price difference in the market for wear-resistant ceramics.
