Hard compact and method for making the same

摘要

A hard composite member produced by a rapid omni-directional compaction process that includes the steps of: providing a pre-compaction composite comprising a substrate, a superhard member and a layer of braze between the substrate and the superhard member; placing the pre-compaction composite in a pressure transmitting material contained within a shell to form an isostatic die assembly; heating the isostatic die assembly to a temperature at which the pressure-transmitting material is capable of fluidic flow and wherein the temperature ranges between greater than the melting point of the braze layer and less than or equal to about 1200° C.; and in a forging press, compressing the isostatic die assembly to consolidate the pre-compaction composite under omnidirectional pressure at a pressure equal to or greater than about 60,000 psi into a dense, consolidated body.

主权项

1. A rapid omni-directional compaction process for producing a hard composite body comprising the steps of:
providing a pre-compaction composite comprising a substrate comprising a partially dense green body containing a cavity opening at one surface of the green body, and the pre-compaction composite further comprising a superhard member within the cavity, and wherein the superhard member comprises one selected from the group consisting of cobalt-leached TSP diamond or silicon carbide-bonded TSP diamond or silicon compound-bonded TSP diamond or nickel-coated cobalt-leached TSP diamond or coated cobalt-leached TSP diamond; placing the pre-compaction composite in a bed of flowable particles; and effecting pressurization of said bed to cause pressure transmission equal to or greater than about 60,000 psi via said particles to said pre-compaction composite, thereby to consolidate the pre-compaction composite into the hard composite body wherein the hard composite body comprises the superhard member mechanically retained within the cavity due to the shrinkage in volume of the partially dense green body upon consolidation of the pre-compaction composite.