US4466829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tungsten carbide-base hard alloy for hot-working apparatus members
Assignee: Mitsubishi Metal Corp
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Filing: 1982-04-02
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Granted: 1984-08-21
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Expires: 2002-04-02
Abstract
Abstract A WC-Ni-Co-Al-Cr system hard alloy suitable as a material for hot working apparatus members has a lower Co content than conventionally used WC-Co system alloys and contains in place thereof greater quantities of Ni and Al, whereby, and also because the oxygen content is suppressed at a low level, fine particles of gamma ' phase (Ni3Al) are precipitated in a binder phase which binds the disperse phase of WC to impart characteristics such as excellent toughness, abrasion resistance, high-temperature strength, and oxidation resistance.
Inventors
- 👤 Kenichi Nishigaki
- 👤 Magoichi Takahashi
- 👤 Keiichi Wakashima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:38
CPC Classifications
C; C22; C22C; C22C29/00; C22C29/02; C22C29/06; C22C29/067
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
141 words
A tungsten carbide-base hard alloy suitable for hot-working apparatus members, said alloy having a disperse phase and a binder phase and consisting of, by weight, 0.1-2% of Cr, 0.1-3% of Al, 5-30% of Ni, 2.5-15% of Co, 0-0.2% in total of one or both of B and Zr, and 0-2% in total of at least one of vanadium carbide, tantalum carbide and niobium carbide, the remainder of said alloy being tungsten carbide and inevitable impurities, said Al content having been produced in situ in said alloy from AlN, said alloy having substantially no nitrogen remaining therein, wherein the content of oxygen as an inevitable impurity is not more than 0.05%; said tungsten carbide forms said disperse phase of an average particle size of 2-8 μm; and said binder phase contains fine particles of precipitated γ' phase of Ni 3 Al structure.
Claim 2
Dependent Claim
141 words
A tungsten carbide-base hard alloy suitable for hot-working apparatus members, said alloy having a disperse phase and a binder phase and consisting of, by weight, 0.1-2% of Cr, 0.1-3% of Al, 5-30% of Ni, 2.5-15% of Co, 0-0.2% in total of one or both of B and Zr, and 0-2% in total of at least one of vanadium carbide, tantalum carbide and niobium carbide, the remainder of said alloy being tungsten carbide and inevitable impurities, said Al content having been produced in situ in said alloy from AlN, said alloy having substantially no nitrogen remaining therein, wherein the content of oxygen as an inevitable impurity is not more than 0.05%; said tungsten carbide forms said disperse phase of an average particle size of 2-8 μm; and said binder phase contains fine particles of precipitated γ' phase of Ni 3 Al structure.
Claim 3
Dependent Claim
20 words
An alloy according to claim 1, wherein the average particle size of the γ' phase is 0.3 μm or less.
Claim 4
Dependent Claim
17 words
An alloy according to claim 1, wherein said Cr is introduced by addition of Cr 2 N.
Claim 5
Dependent Claim
24 words
An alloy according to claim 1, wherein containing at least one of B and Zr in a quantity of 0.01 to 0.2% by weight.
Claim 6
Dependent Claim
32 words
An alloy according to any one of claims 1 and 4, containing at least one of vanadium carbide, tantalum carbide and niobium carbide in a quantity of 0.1 to 2% by weight.
Claim 7
Dependent Claim
17 words
An alloy according to claim 1, wherein the content of the tungsten carbide is 50% or more.
Claim 8
Dependent Claim
13 words
An alloy according to claim 1, which is in the form of powder.
References Cited (Backward Citations)
FR2066359A5
Cited
US3771975A
Cited
US3917463A
Cited
US3916497A
Cited
US3993446A
Cited
GB2000810A
Cited
WO1980002569A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-08-21 | 1988-02-20 | 1988-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-21 | 1992-02-20 | 1992-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-21 | 1996-02-20 | 1996-08-21 | $7700.00 | Window Closed / Lapsed |