US5521150A
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Method of joining Y-based oxide superconductors
Assignee: SHIKOKU DENRYOKU KK
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Filing: 1994-09-15
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Granted: 1996-05-28
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Expires: 2014-09-15
Abstract
Abstract Disclosed is a method of joining Y-based oxide superconductors on joining two or more Y-based oxide superconductors made by melting process under pressure, characterized by incorporating REBa 2 Cu 3 O 7- δ (RE=Y, Ho, Er, Tm or Yb), Ag and BaCuO 2 -CuO type composition to the joining interface as an adhesive phase for joining. It becomes possible to easily make a joined material that does not deteriorate the superconductive characteristic at joined interface.
Inventors
- 👤 Masato Murakami
- 👤 Hiroshi Takaichi
- 👤 Naomichi Sakai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:18
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/64; C04B35/645; C04B35/01; C04B35/45; C04B35/4504; C04B35/4508; C04B37/00; C04B37/003; C04B37/005; H; H01; H01R; H01R4/00; H01R4/58; H01R4/68; H10; H10N; H10N60/00; H10N60/80; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3224; C04B2235/3225; C04B2235/65; C04B2235/656; C04B2235/6565; C04B2237/00; C04B2237/02; C04B2237/04; C04B2237/06; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/50; C04B2237/70; C04B2237/708; Y; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/917; Y10S505/927
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
75 words
A method of joining Y-based oxide superconductors, comprising the steps of: inserting thin pieces of the superconductor RE'Ba 2 Cu 3 O 7- δ between said Y-based oxide superconductors, and applying pressure and heating to form a liquid phase, wherein said superconductor RE'Ba 2 Cu 3 O 7- δ has a melting point lower than that of said Y-based oxide superconductors, and RE' is selected from the group consisting of Ho, Er, Tm and Yb.
Claim 2
Independent Claim
75 words
A method of joining Y-based oxide superconductors, comprising the steps of: inserting thin pieces of the superconductor RE'Ba 2 Cu 3 O 7- δ between said Y-based oxide superconductors, and applying pressure and heating to form a liquid phase, wherein said superconductor RE'Ba 2 Cu 3 O 7- δ has a melting point lower than that of said Y-based oxide superconductors, and RE' is selected from the group consisting of Ho, Er, Tm and Yb.
Claim 3
Independent Claim
70 words
A method of joining Y-based oxide superconductors, comprising the steps of: supplying a powder between said Y-based oxide superconductors, and applying pressure and heating in order to form a liquid phase, wherein said powder comprises a material selected from the group consisting of REBa 2 Cu 3 O 7- δ, Ag or BaCuO 2 -CuO, and RE is selected form the group consisting of Y, Ho, Er, Tm and Yb.
Claim 4
Independent Claim
70 words
A method of joining Y-based oxide superconductors, comprising the steps of: supplying a powder between said Y-based oxide superconductors, and applying pressure and heating in order to form a liquid phase, wherein said powder comprises a material selected from the group consisting of REBa 2 Cu 3 O 7- δ, Ag or BaCuO 2 -CuO, and RE is selected form the group consisting of Y, Ho, Er, Tm and Yb.
Claim 5
Dependent Claim
28 words
The method of claim 1 or 2, wherein said Y-based oxide superconductors comprise a Y 2 BaCuO 5 phase in an amount of 5 mol % or more.
Claim 6
Dependent Claim
15 words
The method of claim 1 or 2, wherein said Y-based oxide superconductors are aligned crystals.
Claim 7
Dependent Claim
14 words
The method of claim 1 or 2, wherein said heating is for 1-10 hours.
Claim 8
Dependent Claim
17 words
The method of claim 1 or 2, wherein said heating is at a temperature of 900°-990° C.
Claim 9
Dependent Claim
21 words
The method of claim 1 or 2, further comprising the step of cooling at a rate of 2° C./hr or less.
Claim 10
Dependent Claim
10 words
The method of claim 2, wherein said powder comprises Ag.
Claim 11
Dependent Claim
30 words
The method of claim 2, wherein said powder comprises REBa 2 Cu 3 O 7- δ, and RE is selected from the group consisting of Ho, Er, Tm and Yb.
Claim 12
Dependent Claim
12 words
The method of claim 2, wherein said powder comprises BaCuO 2 -CuO.
Claim 13
Dependent Claim
25 words
The method of claim 10, wherein said powder is BaCuO 2 -CuO with a molar ratio of 3 moles BaCuO 2 to 2 moles CuO.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-05-28 | 1999-11-27 | 2000-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-05-28 | 2003-11-27 | 2004-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-05-28 | 2007-11-27 | 2008-05-28 | $7700.00 | Window Closed / Lapsed |