CUBIC BORON NITRIDE POLYCRYSTAL, CUTTING TOOL, WEAR RESISTANT TOOL, GRINDING TOOL, AND METHOD FOR PRODUCING CUBIC BORON NITRIDE POLYCRYSTAL

摘要

This cubic boron nitride polycrystal comprises cubic boron nitride which has an average particle size of 150 nm or less and a crack initiation load of 25 N or greater in a fracture strength test in which a load is applied at a velocity of 100 N/min using a diamond indenter of R200 μm.