How to improve the precision machining process of alumina wear-resistant ceramics?

At present, alumina ceramic materials are quite common in the market, which utilize the chemical properties of alumina but do not combine alumina with ceramics. Compared with other materials with the same process route, this alumina ceramic material has significant advantages in thermal conductivity and ductility. In order to improve the processing accuracy of products, most alumina ceramic materials need to be further processed after sintering to obtain higher surface smoothness. But alumina ceramics are not ordinary materials after all, how can its precision machining process be better?
Due to the high hardness of alumina ceramic materials, it is necessary to use harder grinding and polishing materials such as silicon carbide, B4C, or diamond drill bits to complete the process. During the processing, the surface lubricity of alumina ceramic materials should be improved in advance.
In the precision machining of alumina ceramic materials, a common method is to grind from coarse to fine abrasives step by step, and then in external polishing, polishing can choose micron alumina micro powder or diamond drill paste smaller than 1 μ for grinding and polishing. Of course, laser processing and ultrasonic processing can also achieve the purpose of grinding and polishing alumina ceramics.
This is to improve the surface smoothness of alumina ceramics, thereby enhancing the mechanical strength of alumina ceramics, that is, the strengthening technology of alumina ceramics. In fact, the appearance of alumina ceramics adopts advanced technologies such as electron beam vacuum coating, sputtering vacuum coating, or chemical vapor evaporation coating, which enables alumina ceramics to be toughened.
These methods can coat a layer of silicon composite film on the surface of alumina ceramics. Only by heating at 1200 ℃~1580 ℃ can the alumina ceramics be toughened. On this basis, the mechanical strength of the reinforced alumina ceramics can be greatly improved, and ultra-high strength alumina ceramics can be obtained.