Patent ID: 9279291
Filing Date: 2016-03-08
CPC Classification: B22F,C22C,E21B

Claim Text:
1. An insert for use with a bit for drilling subterranean formations, the bit comprising a body and a plurality of the inserts disposed thereon, the insert comprising: a substrate; a working layer of polycrystalline diamond material on an uppermost end of the insert to contact the subterranean formation during a drilling operation, wherein the polycrystalline diamond material comprises: an inner transition layer between the working layer and the substrate, wherein the inner transition layer is adjacent to the substrate and disposed over an entire interfacing surface of the substrate; wherein the inner transition layer has a hardness that is at least 500 HV greater than the hardness of the substrate, and does not exceed the hardness of the substrate by more than 1500 HV.