US4395432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
β-Alumina coating
Assignee: Westinghouse Electric Corp
•
Filing: 1981-12-16
•
Granted: 1983-07-26
•
Expires: 2001-12-16
Abstract
Abstract Disclosed is a method of coating a substrate with β-alumina, a compound of alumina and an alkali metal oxide, while maintaining its electrically conductive properties. A powdered mixture is formed of the β-alumina and a carbonate of the alkali metal. The mixture is sprayed through a source of heat sufficient to melt it onto the substrate. A plasma spray torch can be used to melt spray the mixture.
Inventors
- 👤 Frank D. Rizzelli
- 👤 Kimon Papadopoulos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:19
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/10; C04B35/111; C04B35/113; C03; C03C; C03C17/00; C03C17/22; C03C17/23; C04B41/00; C04B41/45; C04B41/50; C04B41/5025; C04B41/5031; C23; C23C; C23C4/00; C23C4/04; C23C4/10; C23C4/11; H; H01; H01M; H01M10/00; H01M10/36; H01M10/39; H01M10/3909; H01M10/3918; C03C2217/00; C03C2217/20; C03C2217/21; C03C2217/214; C03C2217/23; C03C2218/00; C03C2218/10; C03C2218/17; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
66 words
A method of coating a substrate with β-alumina, a compound of alumina and an alkali metal oxide, comprising: (1) forming a powdered mixture of about 80 to about 95% by weight β-alumina and about 5 to about 20% by weight of a carbonate of an alkali metal; and (2) spraying said powdered mixture through a source of heat sufficient to melt it, and onto said substrate.
Claim 2
Independent Claim
66 words
A method of coating a substrate with β-alumina, a compound of alumina and an alkali metal oxide, comprising: (1) forming a powdered mixture of about 80 to about 95% by weight β-alumina and about 5 to about 20% by weight of a carbonate of an alkali metal; and (2) spraying said powdered mixture through a source of heat sufficient to melt it, and onto said substrate.
Claim 3
Dependent Claim
51 words
A method according to claim 1 wherein said β-alumina is a compound of about 80 to about 95 mole percent M 2 O and about 5 to about 20 mole percent Al 2 O 3 , where M is selected from the group consisting of Na, Li, K, and mixtures thereof.
Claim 4
Dependent Claim
10 words
A method according to claim 2 wherein M is Na.
Claim 5
Dependent Claim
29 words
A method according to claim 1 wherein said mixture comprises about 5 to about 10% by weight of said carbonate and about 90 to about 95% by weight β-alumina.
Claim 6
Dependent Claim
17 words
A method according to claim 1 wherein said mixture has a particle size less than 100 mesh.
Claim 7
Dependent Claim
16 words
A method according to claim 1 wherein said mixture is heated with a plasma spray torch.
Claim 8
Dependent Claim
23 words
A method according to claim 1 wherein the alkali metal in said carbonate is the same alkali metal that is in said β-alumina.
Claim 9
Independent Claim
89 words
A method of coating a substrate with a compound having the general formula nM 2 O. (1-n)Al 2 O 3 where n is 0.005 to 0.20 amd M is selected from the group consisting of Na, Li, K, and mixtures thereof, comprising: (1) forming a mixture having a particle size less than 100 mesh of about 80 to about 95% by weight of said compound and about 5 to about 20% M 2 CO 3 ; (2) melt spraying said mixture onto said substrate using a plasma spray torch.
Claim 10
Independent Claim
89 words
A method of coating a substrate with a compound having the general formula nM 2 O. (1-n)Al 2 O 3 where n is 0.005 to 0.20 amd M is selected from the group consisting of Na, Li, K, and mixtures thereof, comprising: (1) forming a mixture having a particle size less than 100 mesh of about 80 to about 95% by weight of said compound and about 5 to about 20% M 2 CO 3 ; (2) melt spraying said mixture onto said substrate using a plasma spray torch.
Claim 11
Dependent Claim
10 words
A method according to claim 8 wherein M is Na.
Claim 12
Dependent Claim
32 words
A method according to claim 8 wherein said mixture is about 5 to about 10% by weight M 2 CO 3 and about 90 to about 95% by weight of said compound.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-07-25 | 1987-01-24 | 1987-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-25 | 1991-01-24 | 1991-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-25 | 1995-01-24 | 1995-07-26 | $7700.00 | Window Closed / Lapsed |