Some alumina ceramic materials need to be finished after sintering. For products that can be used as artificial bones, the surface needs to have a high finish, like a mirror surface, to increase lubricity. Due to the high hardness of alumina ceramic materials, it is necessary to use harder grinding and polishing brick materials for finishing. Such as SIC, B4C or diamond drill. Generally, coarse-to-fine abrasives are used for grinding, and the final surface is polished. Generally, Al2O3 micropowder <1μm micron or diamond drill paste can be used for grinding and polishing. In addition, laser processing and ultrasonic processing grinding and polishing methods can also be used.
In order to enhance alumina ceramics and significantly improve its mechanical strength, a new alumina ceramic strengthening process has been introduced abroad. The process is novel and simple. The technical method adopted is to apply a layer of silicon compound film on the surface of alumina ceramics by electron ray vacuum coating, sputtering vacuum coating or chemical vapor deposition method, and heat at 1200 ℃ ~ 1580 ℃ Treatment to toughen alumina ceramics.
The mechanical strength of the reinforced alumina ceramics can be greatly increased on the original basis to obtain alumina ceramics with ultra-high strength.
