Patent US4909984A successfully refreshed from Google Patents.
US4909984A
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High temperature protective coating
Assignee: Alstom SA
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Filing: 1988-12-29
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Granted: 1990-03-20
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Expires: 2008-12-29
Abstract
Abstract A high temperature protective coating formed by an alloy on the basis of nickel, cobalt, chromium, aluminum and also frequently of yttrium. There is improved adherence of the metallic oxide covering layer which forms on the protective coating and increased the oxidation and corrosion resistance. Silicon may be admixed to the alloy as a first addition. The amount of the silicon to be admixed to the alloy lies between 1 and 3% by weight. The oxidation and corrosion resistance can be increased by means of a further addition of zirconium in an amount of 1% by weight. The same results can be obtained by a further addition of tantalum, also in the amount of 1% by weight.
Inventors
- 👤 Lorenz Singheiser
- 👤 Georg Wahl
- 👤 Bernd Jahnke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:57
CPC Classifications
C; C23; C23C; C23C30/00; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12937; Y10T428/12944
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
78 words
A high temperature protective coating made from an alloy consisting essentially of nickel, cobalt, chromium and aluminum especially for structural elements of an austenitic material, the alloy containing 18 to 27% by weight of chromium, 8 to 12% by weight of aluminum, 0.5 to 3% by weight of silicon, 1% weight of zirconium and 5 to 20% by weight of cobalt in relation to the total weight of the alloy, and the remainder of the alloy is nickel.
Claim 2
Dependent Claim
78 words
A high temperature protective coating made from an alloy consisting essentially of nickel, cobalt, chromium and aluminum especially for structural elements of an austenitic material, the alloy containing 18 to 27% by weight of chromium, 8 to 12% by weight of aluminum, 0.5 to 3% by weight of silicon, 1% weight of zirconium and 5 to 20% by weight of cobalt in relation to the total weight of the alloy, and the remainder of the alloy is nickel.
Claim 3
Dependent Claim
87 words
A high temperature protective coating made from an alloy consisting essentially of nickel, cobalt, chromium and aluminum especially for structural elements of an austenitic material, the alloy containing: 18.0 to 27.0% by weight of chromium; 7.0 to 12.0% by weight of aluminum; 0.5 to 3.0% by weight of silicon; 0.5 to 1.0% by weight of yttrium; 0.5 to 3.0% by weight of tantalum; 0.5 to 20% by weight of cobalt in relation to the total weight of the alloy, and the remainder of the alloy being nickel.
Claim 4
Dependent Claim
87 words
A high temperature protective coating made from an alloy consisting essentially of nickel, cobalt, chromium and aluminum especially for structural elements of an austenitic material, the alloy containing: 18.0 to 27.0% by weight of chromium; 7.0 to 12.0% by weight of aluminum; 0.5 to 3.0% by weight of silicon; 0.5 to 1.0% by weight of yttrium; 0.5 to 3.0% by weight of tantalum; 0.5 to 20% by weight of cobalt in relation to the total weight of the alloy, and the remainder of the alloy being nickel.
Claim 5
Dependent Claim
26 words
Coating according to claim 2, wherein the alloy additionally contains 0.1 to 2.0% by weight of titanium in relation to the total weight of the alloy.
Claim 6
Dependent Claim
17 words
Coating according to claim 2, wherein the content of tantalum is 1.0% by weight of the alloy.
References Cited (Backward Citations)
US4034142A
Cited
US4312682A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-03-19 | 1993-09-18 | 1994-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-19 | 1997-09-18 | 1998-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-19 | 2001-09-18 | 2002-03-20 | $7700.00 | Window Closed / Lapsed |