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US5114910A
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Passivation of thin film oxide superconductors
Assignee: Raytheon Co
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Filing: 1990-11-01
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Granted: 1992-05-19
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Expires: 2010-11-01
Abstract
Abstract An oxide superconductor having a high critical temperature is provided with a passivation coating comprising a first layer of a Group II oxide, such as magnesium oxide, and a second layer of a polymer, such as polyimide. The Group II oxide is formed under conditions to be substantially amorphous. After depositing the Group II layer, the encapsulated superconductor is heated to an elevated temperature for a period of time in an oxidizing atmosphere. This restores the high critical temperature to its original value. The polymer is then coated on top of the Group II oxide and cured. The passivation coating is resistant to strong acids, strong bases, and water, is robust, hard, and resilient against scratching.
Inventors
- 👤 Jack Y. Josefowicz
- 👤 David B. Rensch
- 👤 Kai-Wei Nieh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:35
CPC Classifications
H; H10; H10N; H10N60/00; H10N60/01; H10N60/0268; H10N60/0661; H10N60/0716; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/93; Y10S505/00; Y10S505/70; Y10S505/701; Y10S505/702; Y10S505/703; Y10S505/704; Y10T; Y10T428/00; Y10T428/23; Y10T428/239; Y10T428/31504; Y10T428/31721
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
85 words
A passivation coating for oxide superconductors comprising: (a) a first layer of a Group II oxide encapsulating said oxide superconductor, said Group II having a substantially amorphous structure and having a thickness ranging from about 500 Åto 2 μm; and (b) a second layer of a polymer covering said Group II oxide, said polymer comprising a composition selected from the group consisting of polyimide, polybenzyl methacrylate, polybutyl methacrylate, polybutyl styrene, polybutadiene, styrenes, polyamide resins, polyacrylics, polyacrylamides, polystyrenes, polyethylene, polyisoprene, polymethyl pentenes, polymethyl methacrylates, and polyvinyls.
Claim 2
Dependent Claim
85 words
A passivation coating for oxide superconductors comprising: (a) a first layer of a Group II oxide encapsulating said oxide superconductor, said Group II having a substantially amorphous structure and having a thickness ranging from about 500 Åto 2 μm; and (b) a second layer of a polymer covering said Group II oxide, said polymer comprising a composition selected from the group consisting of polyimide, polybenzyl methacrylate, polybutyl methacrylate, polybutyl styrene, polybutadiene, styrenes, polyamide resins, polyacrylics, polyacrylamides, polystyrenes, polyethylene, polyisoprene, polymethyl pentenes, polymethyl methacrylates, and polyvinyls.
Claim 3
Dependent Claim
21 words
The passivation coating of claim 1 wherein said oxide superconductor is selected from the group consisting of Y-Ba-Cu-O, Bi-Sr-Ca-Cu-O, and Tl-Ca-Ba-Cu-O.
Claim 4
Dependent Claim
49 words
The passivation coating of claim 2 wherein said oxide superconductor is selected from the group consisting of Y 1 Ba 2 Cu 3 O x , Bi 2 Sr 2 Ca 2 Cu 3 O x , and Tl 2 Ca 2 Ba 2 Cu 3 O x .
Claim 5
Dependent Claim
16 words
The passivation coating of claim 1 wherein said Group II oxide is about 1,000 Å thick.
Claim 6
Dependent Claim
18 words
The passivation coating of claim 1 wherein said polymer ranges from about 1 to 10 μm in thickness.
Claim 7
Dependent Claim
18 words
The passivation coating of claim 5 wherein said polymer ranges from about 1 to 3 μm in thickness.
Claim 8
Dependent Claim
57 words
A passivation coating for an oxide superconductor consisting essentially of Y 1 Ba 2 Cu 3 O x comprising: (a) a first layer of substantially amorphous magnesium oxide encapsulating said oxide superconductor, said magnesium oxide having a thickness ranging from about 500 Å to 2 μm; and (b) a second layer of polyimide covering said magnesium oxide.
Claim 9
Dependent Claim
57 words
A passivation coating for an oxide superconductor consisting essentially of Y 1 Ba 2 Cu 3 O x comprising: (a) a first layer of substantially amorphous magnesium oxide encapsulating said oxide superconductor, said magnesium oxide having a thickness ranging from about 500 Å to 2 μm; and (b) a second layer of polyimide covering said magnesium oxide.
Claim 10
Dependent Claim
15 words
The passivation coating of claim 7 wherein said magnesium oxide is about 1,000 Å thick.
Claim 11
Dependent Claim
18 words
The passivation coating of claim 7 wherein said polyimide ranges from about 1 to 10 μm in thickness.
Claim 12
Dependent Claim
18 words
The passivation coating of claim 9 wherein said polyimide ranges from about 1 to 3 μm in thickness.
References Cited (Backward Citations)
JPS63318015A
Cited
US4942142A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-05-19 | 1995-11-18 | 1996-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-19 | 1999-11-18 | 2000-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-19 | 2003-11-18 | 2004-05-19 | $7700.00 | Window Closed / Lapsed |