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US5500289A
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Tungsten-based cemented carbide powder mix and cemented carbide products made therefrom
Assignee: Iscar Ltd
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Filing: 1995-06-20
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Granted: 1996-03-19
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Expires: 2015-06-20
Abstract
Abstract 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)2O5+7C->2Ta(Nb)C+5CO
Inventors
- 👤 Ilan Gavish
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:04
CPC Classifications
C; C22; C22C; C22C1/00; C22C1/04; C22C1/05; C22C1/051; C22C1/053; C22C1/055; B; B22; B22F; B22F3/00; B22F3/10; C22C29/00; C22C29/02; C22C29/06; C22C29/08; B22F2302/00; B22F2302/10; B22F2302/20; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12049; Y10T428/12056; Y10T428/12146
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
101 words
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→2Ta(Nb)C+5CO
Claim 2
Dependent Claim
101 words
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→2Ta(Nb)C+5CO
Claim 3
Dependent Claim
62 words
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.
Claim 4
Dependent Claim
36 words
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.
Claim 5
Dependent Claim
56 words
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) 2 O 5 and about 0.18% by weight of elemental carbon.
Claim 6
Dependent Claim
15 words
A tungsten-based cemented carbide product obtained by sintering a powder mix according to claim 1.
Claim 7
Dependent Claim
18 words
A straight tungsten-based cemented carbide product obtained by sintering a powder mix according to claim 2 or 3.
Claim 8
Dependent Claim
17 words
A composite tungsten-based cemented carbide product obtained by sintering of a powder mix according to claim 4.
Claim 9
Dependent Claim
16 words
A cemented carbide metal cutting insert obtained by sintering a powder mix according to claim 1.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-03-19 | 1999-09-18 | 2000-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-03-19 | 2003-09-18 | 2004-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-03-19 | 2007-09-18 | 2008-03-19 | $7700.00 | Window Closed / Lapsed |