Patent ID: 8919463
Filing Date: 2014-12-30
Classification: B22F,B24D,C22C,E21B,Y10T

Abstract:
1. A polycrystalline-diamond cutting element for a drill bit of a downhole tool, comprising: a substrate; and a diamond table bonded to the substrate, the diamond table comprising a diamond filler with a plurality of leached polycrystalline diamond segments that are substantially free of all catalyzing and other metallic material packed therein along at least one working surface thereof, the plurality of leached polycrystalline diamond segments being formed from a polycrystalline diamond blank with a metallic catalyst therein that has been subjected to a first high temperature-high pressure pressing operation having a temperature higher than 1300 C and a pressure greater than 65 KBar, and leached of substantially all metallic materials and the diamond filler, the diamond table comprising the plurality of leached polycrystalline segments having been subjected to a second high temperature-high pressure pressing operation having a temperature higher than 1300 C and a pressure greater than 65 KBar to form the cutting element.