Patent ID: 8109177
Filing Date: 2012-02-07
Classification: B22F,E21B

Abstract:
1. A method for forming a polycrystalline ultra hard material cutter bit having a body comprising: providing a mold; filling at least part of said mold with a first tungsten carbide matrix material to form at least a portion of a blade of said bit body, said at least a portion of a blade defining at least a portion of an outer surface of said blade; filling at least part of said mold adjacent said first matrix material and interior of said first matrix material with a second tungsten carbide matrix material having a different functional property from the first matrix material to form at least a portion of a remainder of said blade interior of said at least a portion of an outer surface; heating the mold with the matrix materials to form the bit body having a blade comprising said at least a portion of the blade having an outer surface formed from the first matrix material and an inner portion of the blade adjacent to the outer surface and radially interior of the outer surface formed from the second matrix material; and removing the formed bit body from the mold, said bit body comprising a pocket extending into a portion of the blade, said pocket having a surface for receiving said polycrystalline ultra hard material cutter, said surface comprising a section formed from the first matrix material and a section formed from the second tungsten carbide matrix material, wherein both sections are formed in said blade, wherein said first matrix material does not line an entire of said pocket surface, and wherein said at least a portion of the outer surface of the blade has higher wear resistance than said at least a portion of the remainder of the blade.