Specialized metallurgical processes – compositions for use therei – Compositions – Consolidated metal powder compositions
Patent
1989-03-02
1990-07-31
Lechert, Jr., Stephen J.
Specialized metallurgical processes, compositions for use therei
Compositions
Consolidated metal powder compositions
75236, 75242, 75242, 75244, 419 13, 419 15, 419 14, 419 16, 419 17, 419 18, 419 23, 419 33, 419 38, 419 46, 419 53, C22C 2904
Patent
active
049448005
ABSTRACT:
A sintered hard metal body having improved heat resistance and higher cutting performance is produced by a process including mixing together at least one hard substance, at least one binder material, and at least one of at least one complex carbide and at least one complex nitride to form a starting mixture each constituent of which is in powdered form. The at least one hard substance is selected from the group consisting of carbides, nitrides, and carbonitrides of transition metals of Groups IVB, VB and VIB of the Periodic Table of Elements, is present as at least one of a carbide, a mixed carbide, a nitride, a mixed nitride, a carbonitride, and a mixed carbonitride, and has a cubic crystal form. The at least one binder metal is selected from the group including iron, nickel and cobalt. The starting mixture is then ground and compressed into a predetermined shape, followed by sintering to melt the at least one binder metal and decompose the complex carbide and/or complex nitride to form at least one of at least one transition metal carbide and at least one transition metal nitride which grows on the surface of the at least one hard substance in powdered form and forms a diffusion inhibiting layer thereon.
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Ettmayer Peter
Kolaska Hans
Bhat Nina
Krupp Widia GmbH
Lechert Jr. Stephen J.
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