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US3979209A
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US
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Ductile tungsten-nickel alloy and method for making same
Assignee: Energy Research and Development Administration ERDA
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Filing: 1975-02-18
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Granted: 1976-09-07
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Expires: 1995-02-18
Abstract
Abstract The present invention is directed to a ductile, high-density tungsten-nickel alloy which possesses a tensile strength in the range of 100,000 to 140,000 psi and a tensile elongation of 3.1 to 16.5 percent in 1 inch at 25°C. This alloy is prepared by the steps of liquid phase sintering a mixture of tungsten-0.5 to 10.0 weight percent nickel, heat treating the alloy at a temperature above the ordering temperature of approximately 970°C. to stabilize the matrix phase, and thereafter rapidly quenching the alloy in a suitable liquid to maintain the matrix phase in a metastable, face-centered cubic, solid- solution of tungsten in nickel.
Inventors
- 👤 William B. Snyder, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:48
CPC Classifications
C; C22; C22C; C22C1/00; C22C1/04; C22C1/045; B; B22; B22F; B22F3/00; B22F3/10; B22F3/1035; B22F3/24
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
130 words
A method of preparing a tungsten-nickel alloy of a ductility characterized by a tensile elongation in the range of about 1.0 to about 20.0 percent in 1 inch at 25°C., comprising the steps of forming a powder mixture consisting of tungsten and about 0.5 to about 10 weight percent nickel, pressing the mixture into a compact, heating the compact in a hydrogen atmosphere to a temperature above 1510°C. to effect liquid-phase sintering of the powder, heating the compact in an inert atmosphere at a temperature above approximately 970°C. to stabilize the matrix phase, and thereafter quenching the compact to room temperature with sufficient rapidity for maintaining the matrix phase in a metastable, face-centered cubic, solid solution of tungsten in nickel while inhibiting the formation of the intermetallic WNi 4 .
Claim 2
Independent Claim
130 words
A method of preparing a tungsten-nickel alloy of a ductility characterized by a tensile elongation in the range of about 1.0 to about 20.0 percent in 1 inch at 25°C., comprising the steps of forming a powder mixture consisting of tungsten and about 0.5 to about 10 weight percent nickel, pressing the mixture into a compact, heating the compact in a hydrogen atmosphere to a temperature above 1510°C. to effect liquid-phase sintering of the powder, heating the compact in an inert atmosphere at a temperature above approximately 970°C. to stabilize the matrix phase, and thereafter quenching the compact to room temperature with sufficient rapidity for maintaining the matrix phase in a metastable, face-centered cubic, solid solution of tungsten in nickel while inhibiting the formation of the intermetallic WNi 4 .
Claim 3
Dependent Claim
55 words
The method claimed in claim 1, wherein the temperature sufficient to effect the liquid sintering of the powder is in the range of 1510° to 1550°C., and wherein the matrix is stabilized at a temperature in the range of about 970° to 1450°C. for a duration in the range of about 1 to 4 hours.
Claim 4
Dependent Claim
72 words
A sintered tungsten-nickel article consisting essentially of about 0.5 to 10 weight percent nickel and the balance tungsten and characterized by a tensile strength of at least about 100,000 psi, a density in the range of 17.30 to 18.84 g/cc, a tensile elongation in the range of about 3.1 to 16.5 percent in 1 inch at 25°C., and a matrix phase in a metastable, face-centered cubic, solid solution of tungsten in nickel.
Claim 5
Dependent Claim
72 words
A sintered tungsten-nickel article consisting essentially of about 0.5 to 10 weight percent nickel and the balance tungsten and characterized by a tensile strength of at least about 100,000 psi, a density in the range of 17.30 to 18.84 g/cc, a tensile elongation in the range of about 3.1 to 16.5 percent in 1 inch at 25°C., and a matrix phase in a metastable, face-centered cubic, solid solution of tungsten in nickel.
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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) | 1979-09-07 | 1980-03-08 | 1980-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-07 | 1984-03-08 | 1984-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-07 | 1988-03-08 | 1988-09-07 | $7700.00 | Window Closed / Lapsed |