METAL-INFILTRATED POLYCRYSTALLINE DIAMOND COMPOSITE TOOL FORMED FROM COATED DIAMOND PARTICLES

Title:

METAL-INFILTRATED POLYCRYSTALLINE DIAMOND COMPOSITE TOOL FORMED FROM COATED DIAMOND PARTICLES

Document Type and Number:

WIPO Patent Application WO2002068702

Kind Code:

A3

Abstract:

A metal-infiltrated polycrystalline diamond composite tool (60) comprising a plurality of diamond grains (22) forming a continuous polycrystalline diamond matrix (56), a metallic phase (62) being substantially palladium-free and contiguous to the continuous polycrystalline diamond matrix (56), wherein the metallic phase (62) interpenetrates the continuous polycrystalline diamond matrix (56) and substantially wets an outer surface of the continuous polycrystalline diamond matrix (56); and a working surface (68). The metallic phase (62) is formed from an infiltrant (44) and a wetting-enhancement layer (24) disposed on the outer surfaces of the diamond particles (22), with both the infiltrant (44) and wetting-enhancement layer (24) being substantially palladium-free and comprising at least one metal from the group consisting of cobalt, iron, and nickel. The invention also includes a preform (40) for a metal-infiltrated polycrystalline diamond composite tool (60), the preform (40) comprising a container (52), a metallic infiltrant source (54), and a plurality of coated diamonds (20), each coated with a wetting-enhancement layer (24) and, optionally, an activation layer (34), both of which are substantially palladium-free. Methods of forming the metal-infiltrated polycrystalline diamond composite tool (60), the preform (40), and the coated diamond particles (20, 30) used in the tool (60) are also disclosed.

Inventors:

PENDER DAVID CHARLES
IACOVANGELO CHARLES DOMINIC
D EVELYN MARK PHILIP
TYSOE STEVEN ALFRED

Application Number:

PCT/US2002/000733

Publication Date:

April 03, 2003

Filing Date:

January 09, 2002

Export Citation:

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Assignee:

GEN ELECTRIC (US)

International Classes:

B22F1/02; B23B27/14; B23B27/20; C04B37/00; C04B41/45; C04B41/51; C04B41/52; C04B41/81; C04B41/88; C04B41/89; C22C1/05; C22C26/00; (IPC1-7): C22C26/00

Domestic Patent References:

WO1988009826A1

1988-12-15

Foreign References:

US5096465A	1992-03-17
GB712057A	1954-07-14
EP1064991A2	2001-01-03
US5232469A	1993-08-03
EP0520776A2	1992-12-30
US3957461A	1976-05-18

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