US4615864A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Superalloy coating composition with oxidation and/or sulfidation resistance
Assignee: Howmet Corp
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Filing: 1982-04-23
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Granted: 1986-10-07
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Expires: 2002-04-23
Abstract
Abstract Coatings for iron-, nickel- and cobalt-base superalloys. The coatings are applied in order to provide good oxidation and/or sulfidation and thermal fatigue resistance for the substrates to which the coatings are applied. The coatings consist essentially of, by weight, 10 to 50% chromium, 3 to 15% aluminum, 0.1 to 10% manganese, up to 8% tantalum, up to 5% tungsten, up to 5% reactive metal from the group consisting of lanthanum, yttrium and other rare earth elements, up to 5 percent of rare earth and/or refractory metal oxide particles, up to 12% silicon, up to 10% hafnium, and the balance selected from the group consisting of nickel, cobalt and iron, and combinations thereof. Additions of titanium up to 5% and noble metals up to 15% are also contemplated.
Inventors
- 👤 Louis E. Dardi
- 👤 Srinivasan Shankar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:27
CPC Classifications
C; C23; C23C; C23C30/00; C22; C22C; C22C19/00; C22C19/03; C22C19/05; C22C27/00; C22C27/06; C23C4/00; C23C4/04; C23C4/06; C23C4/073; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
54 words
A coating composition for application to nickel, cobalt and iron base superalloys consisting essentially by weight of from 5 to 35% cobalt, 10 to 35% chromium, 5 to 15% aluminum, 0.1 to 10% manganese, up to 8% tantalum, up to 5% tangsten, up to 12% silicon, up to 10% hafnium, and the balance nickel.
Claim 2
Dependent Claim
54 words
A coating composition for application to nickel, cobalt and iron base superalloys consisting essentially by weight of from 5 to 35% cobalt, 10 to 35% chromium, 5 to 15% aluminum, 0.1 to 10% manganese, up to 8% tantalum, up to 5% tangsten, up to 12% silicon, up to 10% hafnium, and the balance nickel.
Claim 3
Dependent Claim
50 words
A coating composition for application to nickel, cobalt and iron base superalloys consisting essentially by weight of from 15 to 40% chromium, 3 to 13% aluminum, 0.1 to 10% manganese, up to 5% tantalum, up to 2% tungsten, up to 12% silicon, up to 10% hafnium, and the balance cobalt.
Claim 4
Dependent Claim
50 words
A coating composition for application to nickel, cobalt and iron base superalloys consisting essentially by weight of from 15 to 40% chromium, 3 to 13% aluminum, 0.1 to 10% manganese, up to 5% tantalum, up to 2% tungsten, up to 12% silicon, up to 10% hafnium, and the balance cobalt.
Claim 5
Dependent Claim
32 words
A composition in accordance with claims 1 or 2 comprising up to 5% by weight of a reactive metal selected from the group consisting of lanthanum, yttrium and the other rare earths.
Claim 6
Dependent Claim
25 words
A composition in accordance with claim 3 wherein said reactive metal is present in an amount between 1 and 3% by weight of the composition.
Claim 7
Dependent Claim
33 words
A composition in accordance with claims 1 or 2 including up to 5% by weight of a member selected from the group consisting of rare earth oxide particles and refractory metal oxide particles.
Claim 8
Dependent Claim
22 words
A composition in accordance with claim 5 wherein said oxide particles are present in an amount between 0.05 and 2.0% by weight.
Claim 9
Dependent Claim
35 words
A composition in accordance with claim 1 or 2 wherein the tantalum is present in an amount between 2.0 and 5.0% by weight, and including from 2.0 to 5.0% by weight of tungsten and/or manganese.
Claim 10
Dependent Claim
21 words
A composition in accordance with claim 7 wherein the amount of tungsten does not exceed 1.5% by weight of the coating.
Claim 11
Dependent Claim
30 words
A composition in accordance with claim 2 including from 10 to 20% by weight cobalt, from 15 to 25% by weight chromium, and from 10 to 14% by weight aluminum.
Claim 12
Dependent Claim
33 words
A composition in accordance with claims 1 or 2 including from about 0.05 up to about 15% by weight of a noble metal selected from the group consisting of platinum, rhodium or palladium.
Claim 13
Dependent Claim
15 words
A composition in accordance with claim 1 including up to about 5% by weight titanium.
Claim 14
Dependent Claim
20 words
A composition in accordance wih claims 1 or 2 wherein said manganese is present in amounts between 1 and 4%.
Claim 15
Dependent Claim
15 words
A composition in accordance with claim 2 including up to about 5% by weight titanium.
References Cited (Backward Citations)
US4219592A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-10-06 | 1990-04-07 | 1990-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-06 | 1994-04-07 | 1994-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-06 | 1998-04-07 | 1998-10-07 | $7700.00 | Window Closed / Lapsed |