CUBIC BORON NITRIDE COMPOSITE POLYCRYSTAL, PRODUCTION METHOD THEREOF, AND CUTTING TOOL, ABRASION RESISTANCE TOOL AND GRINDING TOOL EACH EQUIPPED WITH THE CUBIC BORON NITRIDE COMPOSITE POLYCRYSTAL

摘要

PROBLEM TO BE SOLVED: To provide a cubic boron nitride composite polycrystal having excellent crack propagation resistance, a production method thereof, and a cutting tool, an abrasion resistant tool and a grinding tool each equipped with the polycrystal.SOLUTION: A cubic boron nitride composite polycrystal 10 comprises: granular cubic boron nitride 1; and laminar boron nitride 3. The laminar boron nitride 3 has contact with the granular cubic boron nitride 1, and tabular boron nitride 2 is laminated on the laminar boron nitride 3. The tabular boron nitride 2 at least includes one of cubic boron nitride and wurtzite type boron nitride. The area of the tabular boron nitride 2 is more than 30% and less than 70%, in an area ratio to the whole surface area.