Patent ID: 7441610
Filing Date: 2008-10-28
Classification: B22F,C22C,E21B

Abstract:
1. An ultrahard composite construction comprising a plurality of first material phases dispersed within a matrix second material phase, wherein the first and second material phases each comprise ultrahard materials selected from the group consisting of polycrystalline diamond, polycrystalline cubic boron nitride, and mixtures thereof, wherein the composite construction is formed by combining a plurality of granules and subjecting the granules to high pressure/high temperature conditions, wherein the granules each comprise a core forming the composite construction first material phase, and a shell that encapsulates the core and that forms at least a portion of the composite construction second material phase, and wherein the ultrahard material used to form the plurality of first material phases has a volume fraction of ultrahard constituent different from that in the ultrahard material used to form the second material phase.