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Tungsten-based-cemented-carbide-powder-mix-and-cemented-carbide-products-made-therefrom

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Tungsten-based cemented carbide powder mix and cemented carbide products made therefrom

Details

Inventors: Gavish, Ilan;
Assignee: ISCAR Ltd. (IL)
Primary Examiner: Walsh; Donald P.
Assistant Examiner: Greaves; John N.
Attorney, Agent or Firm: Pennie & Edmonds

A sinterable powder mix for the production of a tungsten-based cemented carbide material, said powder mix comprising at least 70% by weight of WC, from about 2 to about 15% by weight of an iron group metal binder, and optionally up to about 15% by weight of one or more carbides, nitrides and carbonitrides of metals of the groups IVb, Vb and VIb of the periodic table; characterized in that said powder mix comprises from about 1 to about 8% by weight of Ta(Nb) oxide and powdered elemental carbon in about the stoichiometric amount required for the reaction: Ta(Nb).sub.2 O.sub.5 +7C.fwdarw.2Ta(Nb)C+5CO

DETAILED DESCRIPTION I claim: 1.
A sinterable powder mix for the production of a tungsten-based cemented carbide material, said powder mix comprising at least 70% by weight of WC, from about 2 to about 15% by weight of an iron group metal binder, and optionally up to about 15% by weight of one or more carbides, nitrides and carbonitrides of metals of the groups IVb, Vb and VIb of the periodic table; characterized in that said powder mix comprises from about 1 to about 8% by weight of Ta(Nb) oxide and powdered elemental carbon in about the stoichiometric amount required for the reaction: Ta(Nb).
sub.
2 O.
sub.
5 +7C.
fwdarw.
2Ta(Nb)C+5CO 2.
A sinterable powder mix according to claim 1 for the production of a straight tungsten-based cemented carbide material, said powder mix consisting of from about 6 to about 8% by weight of cobalt binder, from about 1 to about 3% by weight of Ta(Nb) oxide and a corresponding amount of powdered elemental carbon as defined in claim 1, the balance being WC.
3.
A sinterable powder mix according to claim 2, comprising about 2.
3% by weight of Ta(Nb) oxide, about 0.
4% by weight of carbon powder and about 8% by weight of cobalt binder, the balance consisting of WC.
4.
A sinterable powder mix according to claim 1 for the production of a composite tungsten-based cemented carbide material, said mix comprising about 90% by weight of WC, about 6% by weight of Co, about 2.
65% by weight of TiC, about 1.
3% by weight of Ta(Nb).
sub.
2 O.
sub.
5 and about 0.
18% by weight of elemental carbon.
5.
A tungsten-based cemented carbide product obtained by sintering a powder mix according to claim 1.
6.
A straight tungsten-based cemented carbide product obtained by sintering a powder mix according to claim 2 or 3.
7.
A composite tungsten-based cemented carbide product obtained by sintering of a powder mix according to claim 4.
8.
A cemented carbide metal cutting insert obtained by sintering a powder mix according to claim 1.

Description:
FIELD OF THE INVENTION The present invention concerns an improved tungsten-based cemented carbide material and a powder mix for the production of that improved material by sintering

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