CUBIC BORON NITRIDE POLYCRYSTALLINE MATERIAL, CUTTING TOOL, ABRASION-RESISTANT TOOL, GRINDING TOOL, AND PRODUCTION METHOD OF CUBIC BORON NITRIDE POLYCRYSTALLINE MATERIAL

摘要

PROBLEM TO BE SOLVED: To provide a tough cubic boron nitride polycrystalline material having a small particle diameter.SOLUTION: The cubic boron nitride polycrystalline material comprises cubic boron nitride; and the cubic boron nitride has an average particle diameter of 150 nm or less and shows a crack initiation load of 25 N or more in a fracture strength test by using a diamond presser having a radius of 200 μm under a loading speed of 100 N/min.SELECTED DRAWING: None