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US4476164A
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US
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Deposition of improved SiC coatings on carbon-base materials
Assignee: RTX Corp
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Filing: 1982-06-24
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Granted: 1984-10-09
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Expires: 2002-06-24
Abstract
Abstract Carbon-carbon composite materials are provided with significantly enhanced oxidation resistance by the formation of a SiC coating. The coating is produced from a pack containing a small but effective amount of boron. The balance of the pack is preferably based on Al 2 O 3 , SiO 2 , and Si. The composite to be coated is embedded in the pack and heated to an elevated temperature. The boron addition provides a conversion SiC coating having enhanced resistance to oxidation.
Inventors
- 👤 Richard D. Veltri
- 👤 Francis S. Galasso
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:37
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/50; C04B41/5053; C04B41/5057; C04B41/5059; C04B41/80; C04B41/81; C04B41/85; C04B41/87; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/30
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
51 words
In the method of forming a SiC coating on a carbon-base material by a pack technique in which the article is surrounded by a mass of powder, which is capable of generating vapors of Si and Si compounds, and heated, the improvement which comprises: adding 0.5-3% boron to the pack material.
Claim 2
Dependent Claim
51 words
In the method of forming a SiC coating on a carbon-base material by a pack technique in which the article is surrounded by a mass of powder, which is capable of generating vapors of Si and Si compounds, and heated, the improvement which comprises: adding 0.5-3% boron to the pack material.
Claim 3
Dependent Claim
20 words
A method as in claim 1 in which the pack comprises essentially Si, SiC and Al 2 O 3 .
References Cited (Backward Citations)
US3935034A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-09 | 1988-04-09 | 1988-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-09 | 1992-04-09 | 1992-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-09 | 1996-04-09 | 1996-10-09 | $7700.00 | Window Closed / Lapsed |