US4138512A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for chemical vapor deposition of a homogeneous alloy of refractory metals
Assignee: United States Department of the Army
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Filing: 1977-10-17
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Granted: 1979-02-06
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Expires: 1997-10-17
Abstract
Abstract A coating of refactory metals alloy, e.g. an alloy of tantalum and tungsten, is deposited on a substrate, such as the bore of a gun barrel, by reacting an alloy of the refractory metals with chlorine to form a mixture of the vapors of the refractory metal chlorides and reacting the resulting mixture of vapors with hydrogen to reduce the metal chlorides to the free metals. The alloy coating thus deposited possesses a finer grain structure and is more homogeneous and ductile than one obtained by chlorinating the tantalum and tungsten metals separately.
Inventors
- 👤 Fred A. Glaski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:41
CPC Classifications
F; F41; F41A; F41A21/00; F41A21/22; C; C23; C23C; C23C16/00; C23C16/06; C23C16/08; C23C16/44; C23C16/448; C23C16/4488
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
84 words
In a process of vapor depositing an alloy consisting essentially of refractory metals selected from the group consisting of tantalum, tungsten, molybdenum and niobium, on a substrate, wherein a coating of the alloy is deposited by reducing a mixture of the vapors of the refractory metal chlorides with hydrogen, the improvement which comprises generating the mixture of the vapors of the metal chlorides by contacting an alloy of the refractory metals with gaseous chlorine and reacting the resulting mixture of vapors with gaseous hydrogen.
Claim 2
Dependent Claim
84 words
In a process of vapor depositing an alloy consisting essentially of refractory metals selected from the group consisting of tantalum, tungsten, molybdenum and niobium, on a substrate, wherein a coating of the alloy is deposited by reducing a mixture of the vapors of the refractory metal chlorides with hydrogen, the improvement which comprises generating the mixture of the vapors of the metal chlorides by contacting an alloy of the refractory metals with gaseous chlorine and reacting the resulting mixture of vapors with gaseous hydrogen.
Claim 3
Dependent Claim
15 words
A process according to claim 1, wherein the alloy consists essentially of tantalum and tungsten.
Claim 4
Dependent Claim
14 words
A process according to claim 1, wherein the substrate is a steel gun bore.
References Cited (Backward Citations)
CA468796A
Cited
US1226925A
Cited
GB577504A
Cited
US2885310A
Cited
US2815299A
Cited
US3188230A
Cited
US3268362A
Cited
FR1527560A
Cited
US3781173A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-02-05 | 1982-08-07 | 1983-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-05 | 1986-08-07 | 1987-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-05 | 1990-08-07 | 1991-02-06 | $7700.00 | Window Closed / Lapsed |