COMPOSITE HARD CERAMIC PARTICLES

摘要

PURPOSE:To improve the balance between the wear resistance and toughness of a sintered hard alloy as a whole. CONSTITUTION:In composite ceramics having two or more kinds of phases, two or more particles (1) of 1-500nm mean particle diameter having a 1st phase are dispersed in each of matrix particles (2) of 0.5-10mum mean particle diameter having a 2nd phase. The occupancy ratio of the 1st phase is 10-70vol.% in terms of volume and has a higher coefft. of thermal expansion than the 2nd phase by 5X10<-7> and both the 1st and 2nd phases have >=1,500 Vickers hardness.