Roughness generally refers to surface roughness. Surface roughness refers to the unevenness of the small spacing and tiny peaks and valleys on the processed surface. The smaller the surface roughness, the smoother the surface.
Alumina ceramics are not ordinary materials, and their hardness is relatively large. In order to improve the precision of the product, most alumina materials are further processed after the sintering process.
Due to the good properties of alumina ceramic materials, it is necessary to use harder grinding and polishing brick materials for fine processing, such as SIC, B4C or diamonds; and in the process of fine processing, the lubricity of the surface of alumina ceramic materials must be improved in advance.
In the fine processing of alumina ceramic materials, the more common method is to grind from coarse to fine abrasives step by step, and then polish the surface. When polishing, Al203 micro powder or diamond paste less than 1μm can be used for grinding and polishing. Of course, laser processing and ultrasonic processing can also achieve the purpose of grinding and polishing alumina ceramics.
The surface roughness of alumina ceramics has a great influence on the use of parts. Generally speaking, a small surface roughness value will improve the quality of fit, reduce wear and extend the service life of parts, but the processing cost of alumina ceramics will increase. Therefore, it is necessary to correctly and reasonably select the surface roughness value. When designing parts, the choice of surface roughness value is determined by the role of the parts in the machine.