C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
261/6
C04B 35/56 (2006.01) B01J 3/06 (2006.01) B22F 3/15 (2006.01) B24D 3/10 (2006.01)
Patent
CA 1105948
ABSTRACT OF THE DISCLOSURE A cavity of predetermined size is formed in a compressed pressure-transmitting powder medium. A mass of diamond crystals is placed in contact with a mass of elemental silicon, and both masses are disposed within the cavity. Additional pressure-transmitting powder is placed over the cavity, producing a powder-enveloped cavity. Pressure is applied to the powder medium, resulting in substantially isostatic pressure being applied to the cavity and its contents sufficient to dimensionally stabilise the cavity and its contents. The resulting shaped substantially isostatic system of powder- enveloped diamond and silicon is hot-pressed to liquefy the silicon and cause it to infiltrate the interstices between the diamond crystals producing, upon cooling, an adherently-bonded integral body. The resulting polycrystalline diamond body consists of a mass of diamond crystals adherently bonded to each other by a silicon atom-containing bonding medium consisting essentially of silicon carbide and elemental silicon. The diamond crystals range in size from about 1 micron ? about 1000 microns. The density of the diamond crystals ranges from about 65% by volume to about but less than 80% by volume of the body. The bonding medium is distributed substantially uniformly through- out the body. At least about 85% by volume and preferably 100% by volume of the portion of the bonding medium in direct contact with the surfaces of the diamond crystals is silicon carbide. The diamond body is substantially pore-free, and is useful as an abrasive, cutting tool, nozzle or other wear-resistant part.
312780
Devries Robert C.
Lee Minyoung
Szala Lawrence E.
Company General Electric
Eckersley Raymond A.
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