Patent ID: 8276691

Claim:
A rotary drill bit, comprising: a bit body configured to engage a subterranean formation, the bit body including a plurality of blades; and a plurality of superabrasive cutting elements, each of the plurality of superabrasive cutting elements attached to a corresponding one of the plurality of blades, at least one of the plurality of superabrasive cutting elements including: a substrate; a superabrasive table, the superabrasive table comprising diamond-silicon carbide composite including: a matrix including nanometer-sized silicon carbide grains; and micrometer-sized diamond grains dispersed through the matrix; and at least one polycrystalline diamond layer disposed between the substrate and the superabrasive table, the at least one polycrystalline diamond layer including a plurality of bonded-together diamond grains that exhibit diamond-to-diamond bonding therebetween and define a plurality of interstitial regions, at least a portion of the interstitial regions including a metal-solvent catalyst disposed therein.