US4150984A
Expired / Lapsed
US
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Tungsten carbide-base sintered alloys and method for production thereof
Assignee: Niterra Co Ltd
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Filing: 1977-09-15
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Granted: 1979-04-24
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Expires: 1997-09-15
Abstract
Abstract A tungsten carbide-base sintered alloy is disclosed, which has a compact three-phase structure consisted of a grain phase of a metal carbide composed mainly of tungsten carbide, a grain covering layer phase of a complex carbo-nitride of titanium and a metal element composed mainly of tungsten in the metal carbide, and a bonding phase composed mainly of nickel and which exhibits very high hardness and high-wear-resistance properties.
Inventors
- 👤 Hiroshi Tanaka
- 👤 Yoshihiro Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:28
CPC Classifications
C; C22; C22C; C22C29/00; C22C29/02; C22C29/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
59 words
A tungsten carbide-base sintered alloy of a compact three-phase structure which consists of a grain phase of very fine grains of a metal carbide composed mainly of tungsten carbide, a grain covering phase of a complex carbo-nitride of titanium and the metal element of the metal carbide, surrounding the fine grains, and a bonding phase composed mainly of nickel.
Claim 2
Dependent Claim
59 words
A tungsten carbide-base sintered alloy of a compact three-phase structure which consists of a grain phase of very fine grains of a metal carbide composed mainly of tungsten carbide, a grain covering phase of a complex carbo-nitride of titanium and the metal element of the metal carbide, surrounding the fine grains, and a bonding phase composed mainly of nickel.
Claim 3
Independent Claim
142 words
A method for producing a tungsten carbide-base sintered alloy of a compact three-phase structure which consists of a grain phase of very fine grains of a metal carbide composed mainly of tungsten carbide, a grain covering phase of a complex carbo-nitride of titanium and the metal element of the metal carbide, surrounding the fine grains, and a bonding phase composed mainly of nickel; said method comprising adding a carbon powder to a mixture consisting of 5 to 25% by weight of a nickel powder, 2 to 20% by weight of a titanium nitride powder, and the remainder being a metal carbide powder composed mainly of a tungsten carbide powder, the amount of the carbon powder being 2 to 12% by weight based on the weight of the titanium nitride powder, and molding and sintering the mixture, whereby said sintered alloy is produced.
Claim 4
Independent Claim
142 words
A method for producing a tungsten carbide-base sintered alloy of a compact three-phase structure which consists of a grain phase of very fine grains of a metal carbide composed mainly of tungsten carbide, a grain covering phase of a complex carbo-nitride of titanium and the metal element of the metal carbide, surrounding the fine grains, and a bonding phase composed mainly of nickel; said method comprising adding a carbon powder to a mixture consisting of 5 to 25% by weight of a nickel powder, 2 to 20% by weight of a titanium nitride powder, and the remainder being a metal carbide powder composed mainly of a tungsten carbide powder, the amount of the carbon powder being 2 to 12% by weight based on the weight of the titanium nitride powder, and molding and sintering the mixture, whereby said sintered alloy is produced.
Claim 5
Dependent Claim
16 words
The method of claim 2 wherein the metal carbide powder consists only of tungsten carbide powder.
Claim 6
Dependent Claim
29 words
The method of claim 2 wherein the metal carbide powder consists of a tungsten carbide powder and up to 15% by weight of titanium nitride and/or molybdenum carbide powder.
Claim 7
Dependent Claim
18 words
The method of claim 3 wherein the amount of the titanium nitride is 10 to 15% by weight.
Claim 8
Independent Claim
123 words
A method for producing a tungsten carbide-base sintered alloy of a compact three-phase structure which consists of a grain phase of a metal carbide composed mainly of tungsten carbide, a grain covering phase of a complex carbo-nitride of titanium and a metal element composed mainly of tungsten in the metal carbide, and a bonding phase composed mainly of nickel; said method comprising adding a small amount of a carbon powder to a mixture consisting of 5 to 25% by weight of a nickel powder, a titanium carbide nitride powder which may contain 2 to 20% by weight of a titanium nitride powder, and the remainder being a metal carbide powder composed mainly of a tungsten carbide powder, and molding and sintering the mixture.
Claim 9
Independent Claim
123 words
A method for producing a tungsten carbide-base sintered alloy of a compact three-phase structure which consists of a grain phase of a metal carbide composed mainly of tungsten carbide, a grain covering phase of a complex carbo-nitride of titanium and a metal element composed mainly of tungsten in the metal carbide, and a bonding phase composed mainly of nickel; said method comprising adding a small amount of a carbon powder to a mixture consisting of 5 to 25% by weight of a nickel powder, a titanium carbide nitride powder which may contain 2 to 20% by weight of a titanium nitride powder, and the remainder being a metal carbide powder composed mainly of a tungsten carbide powder, and molding and sintering the mixture.
Claim 10
Dependent Claim
20 words
The method of claim 6 wherein the weight ratio of N/(N+C) in the titanium carbide nitride is at least 0.5.
Claim 11
Dependent Claim
18 words
The method of claim 4 wherein the amount of the titanium nitride is 10 to 15% by weight.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-23 | 1982-10-23 | 1983-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-23 | 1986-10-23 | 1987-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-23 | 1990-10-23 | 1991-04-24 | $7700.00 | Window Closed / Lapsed |