PRODUCTION METHOD OF CUBIC BORON NITRIDE SINTERED BODY, CUBIC BORON NITRIDE SINTERED BODY, AND CUTTING TOOL CONTAINING THIS

摘要

This production method of a cubic boron nitride sintered body involves: a step for preparing organic cubic boron nitride powder by adhering an organic material to cubic boron nitride raw material powder; a step for mixing the organic cubic boron nitride powder and a binder raw material powder containing WC, Co and Al to prepare a mixed powder formed from greater than or equal to 85 vol% and less than 100 vol% organic cubic boron nitride powder, the remainder being the binder raw material powder; and a step for sintering the mixed powder to obtain a cubic boron nitride sintered body.