Dongguan Mingrui Ceramic Technology Co.,Ltd
For zirconia ceramics not burned or roasting, rough machining is used, and grinding is used after sintering.
According to the different conditions of zirconia ceramics, it is also possible to directly grind the sintered body without processing to achieve the design accuracy.
In terms of processing, zirconia ceramics are almost similar to metal parts, but zirconia ceramics have much larger machining allowance.
In the rough processing of unburned or calcined ceramics, it is easy to have the problem of insufficient strength or surface defects, or because of insufficient assembly and other reasons, and cannot obtain the required final shape.
Since the shrinkage cannot be uniform during sintering, the size should not be too close to the final size during rough machining, so there is a large margin for finishing.
For metal working, finishing allowance should be a few hundredths of a millimetre as far as possible, if black leather is considered for thermal deformation and heat treatment.
For ceramic machining, finishing allowance should be a few millimeters or even a dozen millimeters.
High machining allowance, low productivity and high production cost.
The other problem of zirconia ceramics processing is that the high cost of cutting tools, such as sintered diamond and CBN tools, is required for high cost cutting. The precision processing is mainly based on diamond grinding wheel, so the cost of cutting tools is tens to hundreds of times higher than the tools used in metal cutting.
The strength of zirconia ceramics is sensitive to processing conditions and it is difficult to achieve high efficiency processing so the processing cost of zirconia ceramics is much higher than that of ordinary materials.