Patent ID: 8857541
Filing Date: 2014-10-14
Classification: B22F,C22C,E21B

Abstract:
1. An insert for a drill bit comprising: a metallic carbide body; an outer layer of polycrystalline diamond material on the outermost end of the insert, the polycrystalline diamond material comprising a plurality of interconnected first diamond grains and a first binder material and first metal carbide or carbonitride particles in interstitial regions between the interconnected first diamond grains; and at least one transition layer between the metallic, carbide body and the outer layer, the at least one transition layer comprising a composite of second diamond grains, first metal carbide or carbonitride particles, and a second binder material, wherein each of the at least one transition layers has a central thickness of about 85% or less than a central thickness of the outer layer.