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US4920012A
Expired / Lapsed
US
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Articles having coatings of fine-grained and/or equiaxed grain structure
Assignee: General Electric Co
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Filing: 1989-06-09
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Granted: 1990-04-24
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Expires: 2009-06-09
Abstract
Abstract Fine-grained and/or equiaxed tungsten and/or rhenium coatings, substantially free from columnar structure, are deposited on substrates (especially graphite) by chemical vapor deposition by directing the flow of reactant gases to the substrate with high velocity and in close proximity thereto, most often at a velocity gradient of at least about 1050 and preferably at least about 2000 cm./cm.-sec. The deposition process is preferably conducted while moving the substrate so as to coat large areas thereof. By this method, tungsten and/or rhenium-coated articles useful as X-ray targets having excellent properties under conditions of rapid temperature cycling may be produced.
Inventors
- 👤 David W. Woodruff
- 👤 Joan M. Redwing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:12
CPC Classifications
H; H01; H01J; H01J35/00; H01J35/02; H01J35/04; H01J35/08; H01J35/10; C; C23; C23C; C23C16/00; C23C16/06; C23C16/08; H01J9/00; H01J9/02; H01J9/14; H01J2235/00; H01J2235/08; H01J2235/083; H01J2235/084; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12625; Y10T428/12771; Y10T428/12806; Y10T428/12826; Y10T428/1284
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
49 words
An article comprising a substrate, a diffusion barrier of rhenium directly bonded thereto and a coating of tungsten or a tungsten-rhenium combination directly bonded to said diffusion barrier, said coating being free from columnar grain structure and having an average grain size in the range of about 400-10,000 Angstroms.
Claim 2
Dependent Claim
49 words
An article comprising a substrate, a diffusion barrier of rhenium directly bonded thereto and a coating of tungsten or a tungsten-rhenium combination directly bonded to said diffusion barrier, said coating being free from columnar grain structure and having an average grain size in the range of about 400-10,000 Angstroms.
Claim 3
Dependent Claim
11 words
An article according to claim 1 wherein the substrate is graphite.
Claim 4
Dependent Claim
22 words
An article according to claim 2 wherein the average grain size of the coating is in the range of about 5,000-10,000 microns.
Claim 5
Dependent Claim
20 words
An article according to claim 3 wherein the thickness of the coating is in the range of about 500-1,000 microns.
Claim 6
Dependent Claim
21 words
An article according to claim 4 wherein the thickness of the diffusion barrier is in the range of about 5-25 microns.
Claim 7
Dependent Claim
11 words
An article according to claim 3 wherein the coating is tungsten.
Claim 8
Dependent Claim
14 words
An article according to claim 6 wherein the coating has an equiaxed grain structure.
Claim 9
Dependent Claim
13 words
An article according to claim 3 wherein the coating is a tungsten-rhenium combination.
Claim 10
Dependent Claim
14 words
An article according to claim 8 wherein the coating has an equiaxed grain structure.
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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) | 1993-04-23 | 1993-10-23 | 1994-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-23 | 1997-10-23 | 1998-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-23 | 2001-10-23 | 2002-04-24 | $7700.00 | Window Closed / Lapsed |