Patent ID: 8020640
Filing Date: 2011-09-20
Classification: B22F,C22C,E21B

Abstract:
1. A drill bit, comprising: a body having a lower end face for engaging a rock formation, the end face having a plurality of raised ribs extending from the face of the bit body and separated by a plurality of channels therebetween, wherein each of the plurality of ribs comprise a leading edge and a trailing edge; at least one of the plurality of ribs having a leading portion and a trailing portion formed from two different materials, the leading portion comprising the leading edge and the trailing portion comprising the trailing edge; wherein the leading portion extends a circumferential width from the leading edge and the trailing portion extends a circumferential width from the trailing edge, and wherein each of the leading portion and the trailing portion have a substantially continuous composition through the circumferential width; wherein the leading portion comprises a first matrix material impregnated with super abrasive particles and the trailing portion comprises a second matrix material, wherein the second matrix material is devoid of impregnated super abrasive particles; and wherein the first matrix material comprises a plurality of first carbide particles and a first binder and the second matrix material comprises a plurality of second carbide particles and a second binder.