Polycrystalline diamond compacts and drill bits using same

A polycrystalline diamond compact, comprising:

• a substrate;
• and
• a polycrystalline diamond table including an interfacial surface bonded to the substrate and an opposing working surface, the polycrystalline diamond table including a first volume remote from the substrate that is at least partially leached of a metallic infiltrant and substantially free of leaching by-products, and a second volume proximate to the substrate including the metallic infiltrant therein.

A polycrystalline diamond compact, comprising:

• a cemented carbide substrate;
• and
• a pre-sintered polycrystalline diamond table including a planarized interfacial surface bonded to the substrate, the planarized interfacial surface exhibiting a flatness of about 0.00050 inch to about 0.0075 inch, the pre-sintered polycrystalline diamond table including a first volume remote from the cemented carbide substrate that is at least partially leached of a metallic infiltrant and a second volume proximate to the substrate having the metallic infiltrant therein and being substantially free of leaching by-products.

A polycrystalline diamond compact, comprising:

• a cemented carbide substrate;
• and
• a preformed polycrystalline diamond body including an interfacial surface bonded to the substrate and an opposing working surface, the preformed polycrystalline diamond body including a first volume remote from the cemented carbide substrate that is at least partially leached of a metallic infiltrant and a second volume adjacent to the cemented carbide substrate having the metallic infiltrant therein and being substantially free of leaching by-products.