Effects of Grain size on Cutting Performance of Al₂O₃-TiC Ceramics tool

Abstract

Three sorts of Al₂O₃-25 vol% TiC ceramics having different grain sizes were prepared by hot-pressing and cutting performance of the ceramics tools was studied as a function of Al₂O₃ grain size. The results obtained were briefly summarized as follows; The fine grained tools showed the largest flank wear (V_B) in turning test of grey cast iron, but on the other hand, they showed the smallest V_B in the test of alloyed tool steel. The coarse grained tools often exhibited a shorten life time due to flaking.
Discussion on the V_B which had a reverse tendency in relation to the sorts of works and flaking mechanism was finely given.