Patent ID: 8783389

Claim:
A cutting element comprising: a substrate; and a preformed thermally stable polycrystalline diamond body bonded to the substrate with at least an infiltrant, wherein the thermally stable polycrystalline diamond body comprises: a working surface opposite the substrate; a material microstructure comprising a plurality of bonded-together diamond crystals, and pores between the diamond crystals, the pores being substantially free of a catalyst material; a first portion of the material microstructure proximate the substrate and having a porosity; and a second portion of the material microstructure adjacent said first portion along an interface and extending to at least proximate the working surface and having a porosity, wherein the first portion occupies at least 25% of a volume of the polycrystalline diamond body, wherein the first portion comprises said infiltrant material in one or more of the pores between the diamond crystals previously occupied by a catalyst and a filler, said filler being different from said catalyst, and wherein the material microstructure has a differential porosity of at least 1.6% between the first and second portions when said porosities are measured without said infiltrant.