Diamond transition layer construction with improved thickness ratio

摘要

#$%^&*AU2017200754A120170316.pdf#####ABSTRACT A bit for drilling subterranean formation comprising a body and a number of cutting elements operatively connected with the body to engage the subterranean formation to be drilled, wherein the cutting elements comprise a metallic carbide body; an outer layer of polycrystalline diamond material disposed along an outermost surface of the cutting element, the polycrystalline diamond material comprising a plurality of interconnected first diamond grains and a first binder material and first metal carbide or carbonitride particles disposed 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.