US3637422A
Expired / Lapsed
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Dispersion-hardened tungsten alloy
Assignee: United States Atomic Energy Commission
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Filing: 1968-01-03
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Granted: 1972-01-25
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Expires: 1988-01-03
Abstract
Abstract Dispersion-hardened tungsten and tungsten alloy coatings having a material such as hafnium nitride at a concentration above 0.5 percent by volume are produced by covapor depositing tungsten and hafnium nitride. The hafnium nitride is produced in situ by addition of ammonia or nitrogen to a reducing atmosphere of hydrogen, which is mixed with tungsten and hafnium halide vapors in the presence of a substrate mandrel heated to a temperature above 900* C.
Inventors
- 👤 Richard L Landingham
- 👤 James S Kane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:38
CPC Classifications
C; C23; C23C; C23C16/00; C23C16/22; C23C16/30; C23C16/34; C23C16/06; C23C16/56; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12806; Y10T428/12861
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
72 words
The process of claim 1, further defined in that said gaseous reaction mixture includes up to about 6 percent by volume of said tungsten halide, together with a volatilized, dispersoid metal halide component, said dispersoid metal halide being selected from the group consisting of the chlorides and bromides of hafnium, zirconium and titanium and comprising up to slightly more than 0.5 percent by volume of said tungsten halide in said reaction mixture.
Claim 2
Dependent Claim
37 words
The process of claim 2, further defined in that said gaseous reaction mixture also includes an excess of a dispersoid forming agent selected from the group consisting of water, oxygen, hydrocarbons, carbonyls, borontrichloride, borontribromide and boron hydride.
Claim 3
Dependent Claim
171 words
In a process for producing dense and fine-grained deposits of dispersion-hardened tungsten alloys comprising more than about 0.5 percent by volume of dispersoids, the steps comprising: forming a gaseous mixture of volatilized tungsten halide and of dispersoid metal halides selected from the group consisting of hafnium chloride, hafnium bromide, zirconium chloride, zirconium bromide, titanium chloride and titanium bromide, sufficient hydrogen to reduce said halides, and an excess of a dispersoid-forming agent selected from the group consisting of oxygen, water, nitrogen, ammonia, hydrocarbons, carbonyls, boron halides and boron hydride, at a temperature above the highest boiling point of said halides in said mixture and below about 500* C., said dispsersoid metal halides having a volume percent of said tungsten halide slightly greater than the desired volume percent of dispersoids in said dispersion-hardened alloy; and passing said gaseous mixture over a substrate heated to a temperature between about 700* and 1,200* C., thereby causing said gaseous mixture to react and deposit upon said substrate a tungsten matrix having a dispersoid uniformly distributed therethrough.
Claim 4
Dependent Claim
38 words
The process of claim 4, further defined in that said tungsten halide and hafnium halide are tungsten pentachloride and hafnium tetrachloride, respectively, and in that said dispersoid-forming agent is selected from the group consisting of nitrogen and ammonia.
Claim 5
Dependent Claim
38 words
The process of claim 4, further defined in that said tungsten halide and hafnium halide are tungsten hexachloride and hafnium tetrachloride, respectively, and in that said dispersoid-forming agent is selected from the group consisting of Nitrogen and ammonia.
Claim 6
Dependent Claim
38 words
The process of claim 4, further defined in that said tungsten halide and hafnium halide are tungsten pentabromide and hafnium tetrabromide, respectively, and in that said dispersoid-forming agent is selected from the group consisting of nitrogen and ammonia.
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) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |