Patent ID: 8440303

Claim:
A polycrystalline diamond compact, comprising: a cemented carbide substrate including a first cemented carbide portion having a lateral periphery and a second cemented chromium carbide portion bonded to and substantially surrounding the lateral periphery of the first cemented carbide portion, the second cemented chromium carbide portion exhibiting a second erosion resistance that is greater than a first erosion resistance exhibited by the first cemented carbide portion, the second cemented chromium carbide portion exhibiting a concentration of chromium carbide that is greater than that of the first cemented carbide portion; and a polycrystalline diamond table bonded to the first cemented carbide portion, the polycrystalline diamond table including a plurality of bonded diamond grains exhibiting diamond-to-diamond bonding therebetween, the plurality of bonded diamond grains defining a plurality of interstitial regions.