US5660880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-oxidation protection of carbon-based materials
Assignee: Airbus Group SAS
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Filing: 1993-12-16
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Granted: 1997-08-26
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Expires: 2013-12-16
Abstract
Abstract The invention relates to a process for obtaining refractory antioxidative coatings on carbon-based materials and articles operating in an oxidizing environment at temperatures of up to 2000° C. under thermal cycling and high-speed gas stream conditions. The process comprises the heat-treatment of the surface to be protected in silicon vapors and is characterized in that prior to said silicon vapor treatment, the surface to be protected is covered with a layer of the composition consisting of HfB 2 +C powdery filler and a carboxymethyl cellulose-based binder, followed by drying under normal conditions till it is completely dry. The process is intended for oxidation protection of structural elements and articles in metallurgy, aircraft, and other industries.
Inventors
- 👤 Valeriya Veniaminovna Rodionova
- 👤 Gennady Alexandrovich Kravetkii
- 👤 Nadezhda Miklailovna Schestakova
- 👤 Andrey Vasiljevich Kuznetzov
- 👤 Valery Ivanovich Kostikov
- 👤 Alexander Victorovich Demin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:54
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/50; C04B41/5053; C04B41/5057; C04B41/5059; C04B41/52; C04B41/80; C04B41/81; C04B41/85; C04B41/87; C04B41/89
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
69 words
A process for obtaining protective coatings on carbon-based materials and articles, which comprises heat treatment of the surface to be protected in silicon vapors, characterized in that prior to said silicon vapor treatment, the surface to be protected is covered with a layer of a composition consisting of HfB 2 +C powdery filler and a carboxymethyl cellulose-based binder, followed by drying under ambient conditions till it is completely dry.
Claim 2
Dependent Claim
69 words
A process for obtaining protective coatings on carbon-based materials and articles, which comprises heat treatment of the surface to be protected in silicon vapors, characterized in that prior to said silicon vapor treatment, the surface to be protected is covered with a layer of a composition consisting of HfB 2 +C powdery filler and a carboxymethyl cellulose-based binder, followed by drying under ambient conditions till it is completely dry.
Claim 3
Dependent Claim
26 words
A process according to claim 1, characterized in that said powdery components of said composition are taken in the HfB 2 : C ratio of 95:5.
Claim 4
Dependent Claim
15 words
A process according to claim 1, characterized in that C powdery filler is carbon black.
Claim 5
Dependent Claim
16 words
A process according to claim 1, characterized in that said C powdery filler is artificial graphite.
Claim 6
Dependent Claim
15 words
A process according to claim 1, characterized in that said C powdery filler is coke.
Claim 7
Dependent Claim
29 words
A process according to claim 1, characterized in that said carboxymethyl cellulose is used as a 5% aqueous solution in the volume ratio to said powdery components of 1:1.
Claim 8
Dependent Claim
42 words
A process according to claim 1, characterized in that said HfB 2 +C layer is treated in silicon vapors under a pressure of not over 10 Hg mm, at a temperature of about 1850° to 1900° C., for 1 to 3 h.
Claim 9
Dependent Claim
36 words
A process according to claim 1, characterized in that said layer of the composition consisting of the HfB 2 +C filler and the carboxymethyl cellulose-based binder is applied onto a non-siliconized carbon material or article substrate.
References Cited (Backward Citations)
DE1122465B
Cited
US3770487A
Cited
EP0428977A1
Cited
EP0435039A1
Cited
EP0448432A1
Cited
US5368940A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-08-25 | 2001-02-24 | 2001-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-08-25 | 2005-02-24 | 2005-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-08-25 | 2009-02-24 | 2009-08-26 | $7700.00 | Window Closed / Lapsed |