Abstract
When the presintered ceramics are machined with ceramic tool, the tool life becomes extremely short. The CBN tool exhibits the best performance in dry machining of the ceramics presintered at among all cutting tests. The roughness of the machined surface of the ceramics presintered below is smaller than that of the ceramics presintered at While the performance of the cemented carbide and CBN tools is better in dry than in wet machining, the diamond tool shows adverse tendency. The tool life is not affected by the feed rate and depth of cut. During the following full-sintering after the machining of the presintered ceramics, the surface roughness decreases up to 62%. The finished surface in machining the presintered ceramics is much better than that in machining the full-sintered ceramic.
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