DIAMOND ENHANCED INSERT WITH FINE AND ULTRAFINE MICROSTRUCTURE OF PCD WORKING SURFACE RESISTING CRACK FORMATION

摘要

An insert for a drill bit may include a metallic carbide body; an outer layer of polycrystalline diamond material on the uppermost end of the insert, wherein the polycrystalline diamond material comprises: a plurality of interconnected diamond grains; a plurality of additive grains; a binder material; wherein the average additive grain size is smaller than the average diamond grain size.