Patent JPS567503A successfully refreshed from Google Patents.
US4960752A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process to produce oriented high temperature superconductors
Assignee: Olin Corp
•
Filing: 1989-02-27
•
Granted: 1990-10-02
•
Expires: 2009-02-27
Abstract
Abstract A method to manufacture bulk polycrystalline superconducting materials having properties closely related to the properties of a single crystal of the superconducting material is provided. The method includes forming an oriented anisotropic structure by spray casting an atomized precursor onto a ceramic substrate. The precursor may be atomized in a neutral atmosphere and the resultant structure oxidized. In another embodiment, the precursor is atomized in an oxidizing atmosphere and the subsequent oxidation step may be omitted.
Inventors
- 👤 Sankaranarayanan Ashok
- 👤 William G. Watson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:54
CPC Classifications
H; H10; H10N; H10N60/00; H10N60/01; H10N60/0268; H10N60/0296; H10N60/0492; Y; Y10; Y10S; Y10S505/00; Y10S505/725; Y10S505/733; Y10S505/775; Y10S505/776; Y10S505/779; Y10S505/78
Claims Analysis
Total Claims: 44
Claim 1
Independent Claim
84 words
A method for manufacturing a polycrystalline superconductor having oriented anisotropic properties from an oxygen deficient precursor having a desired stoichiometric composition, comprising the steps of: (a). atomizing said precursor into supercooled droplets and directing said atomized precursor onto a ceramic substrate; (b). solidifying said droplets on said ceramic substrate, such that the droplets flatten out upon impact and oriented crystal growth occurs; (c). removing said structure from said ceramic substrate; and (d). oxidizing said structure to form a polycrystalline superconductor having oriented anisotropic properties.
Claim 2
Independent Claim
84 words
A method for manufacturing a polycrystalline superconductor having oriented anisotropic properties from an oxygen deficient precursor having a desired stoichiometric composition, comprising the steps of: (a). atomizing said precursor into supercooled droplets and directing said atomized precursor onto a ceramic substrate; (b). solidifying said droplets on said ceramic substrate, such that the droplets flatten out upon impact and oriented crystal growth occurs; (c). removing said structure from said ceramic substrate; and (d). oxidizing said structure to form a polycrystalline superconductor having oriented anisotropic properties.
Claim 3
Dependent Claim
17 words
The method of claim 1 wherein said precursor is supplied in the form of a molten stream.
Claim 4
Dependent Claim
25 words
The method of claim 2 wherein said stream is atomized in a neutral atmosphere and said method includes the step of subsequently oxidizing said structure.
Claim 5
Dependent Claim
11 words
The method of claim 3 wherein said neutral atmosphere is nitrogen.
Claim 6
Dependent Claim
22 words
The method of claim 1 wherein said substrate is selected from the group consisting of aluminium oxide, magnesium oxide and strontium titanate.
Claim 7
Dependent Claim
11 words
The method of claim 5 wherein said substrate is aluminum oxide.
Claim 8
Dependent Claim
21 words
The method of claim 5 wherein said substrate has an oriented crystalline structure on a surface adapted to receive said droplets.
Claim 9
Dependent Claim
61 words
The method of claim 3 wherein said oxidation step comprises: (a). heating said structure to a temperature in excess of about 800° C. for a time of from about 1 hour to about 36 hours in an oxidizing atmosphere; and (b). gradually cooling said structure at a rate of from about 1° C. per minute to about 20° C. per minute.
Claim 10
Dependent Claim
11 words
The method of claim 8 wherein said oxidizing atmosphere is air.
Claim 11
Dependent Claim
22 words
The method of claim 8 wherein said structure is heated to a temperature of from about 900° C. to about 1100° C.
Claim 12
Dependent Claim
34 words
The method of claim 10 wherein said structure is held at a temperature of from about 900° C. to about 1100° C. for a time of from about 6 hours to about 24 hours.
Claim 13
Dependent Claim
23 words
The method of claim 10 wherein said gradually cooling rate is from about 1° C. per minute to about 2° C. per minute.
Claim 14
Dependent Claim
12 words
The method of claim 8 wherein said substrate is a flexible belt.
Claim 15
Dependent Claim
12 words
The method of claim 8 wherein said substrate is a collecting mold.
Claim 16
Dependent Claim
21 words
The method of claim of claim 10 wherein said precursor comprises a mixture of yttrium, barium and copper or compounds thereof.
Claim 17
Dependent Claim
36 words
The method of claim 1 wherein said precursor is supplied in the form of a plurality of molten streams, each said stream atomized to droplets such that the combination of droplets has a desired stoichiometric ratio.
Claim 18
Dependent Claim
25 words
The method of claim 16 wherein said streams are atomized in a neutral atmosphere and said method includes the step of subsequently oxidizing said structure.
Claim 19
Dependent Claim
11 words
The method of claim 17 wherein said neutral atmosphere is nitrogen.
Claim 20
Dependent Claim
21 words
The method of claim 17 wherein said substrate is selected from the group consisting aluminum oxide, magnesium oxide and strontium titanate.
Claim 21
Dependent Claim
11 words
The method of claim 19 wherein said substrate is aluminum oxide.
Claim 22
Dependent Claim
21 words
The method of claim 19 wherein said substrate has an orient crystalline structure on a surface adapted to receive said droplets.
Claim 23
Dependent Claim
62 words
The method of claim 17 wherein said oxidation step comprises: (a). heating said structure to a temperature of in excess of about 800° C. for a time of from about 1 hour to about 36 hours in an oxidizing atmosphere; and (b). gradually cooling said structure at a rate of from about 1° C. per minute to about 20° C. per minute.
Claim 24
Dependent Claim
11 words
The method of claim 22 wherein said oxidizing atmosphere is air.
Claim 25
Dependent Claim
22 words
The method of claim 22 wherein said structure is heated to a temperature of from about 900° C. to about 1100° C.
Claim 26
Dependent Claim
34 words
The method of claim 24 wherein said structure is held at a temperature of from about 900° C. to about 1100° C. for a time of from about 6 hours to about 24 hours.
Claim 27
Dependent Claim
23 words
The method of claim 24 wherein said gradual cooling rate is from about 1° C. per minute to about 2° C. per minute.
Claim 28
Dependent Claim
12 words
The method of claim 22 wherein said substrate is a flexible belt.
Claim 29
Dependent Claim
12 words
The method of claim 17 wherein said substrate is a collecting mold.
Claim 30
Dependent Claim
14 words
The method of claim 3 wherein said stream is atomized in an oxidizing atmosphere.
Claim 31
Dependent Claim
11 words
The method of claim 29 wherein said oxidizing atmosphere is air.
Claim 32
Dependent Claim
10 words
The method of claim 29 wherein said substrate comprises ceramic.
Claim 33
Dependent Claim
22 words
The method of claim 31 wherein said substrate is selected from the group consisting of aluminum oxide, magnesium oxide and strontium titanate.
Claim 34
Dependent Claim
11 words
The method of claim 32 wherein said substrate is aluminum oxide.
Claim 35
Dependent Claim
21 words
The method of claim 32 wherein said substrate has an oriented crystalline structure on a surface adapted to receive said droplets.
Claim 36
Dependent Claim
12 words
The method of claim 32 wherein said substrate is a flexible belt.
Claim 37
Dependent Claim
12 words
The method of claim 32 wherein said substrate is a collecting mold.
Claim 38
Dependent Claim
14 words
The method of claim 16 wherein said streams are atomized in an oxidizing atmosphere.
Claim 39
Dependent Claim
11 words
The method of claim 37 wherein said oxidizing atmosphere is air.
Claim 40
Dependent Claim
22 words
The method of claim 37 wherein said substrate is selected from the group consisting of aluminum oxide, magnesium oxide and strontium titanate.
Claim 41
Dependent Claim
11 words
The method of claim 39 wherein said substrate is aluminum oxide.
Claim 42
Dependent Claim
21 words
The method of claim 39 wherein said substrate has an oriented crystalline structure on a surface adapted to receive said droplets.
Claim 43
Dependent Claim
12 words
The method of claim 39 wherein said substrate is a flexible belt.
Claim 44
Dependent Claim
12 words
The method of claim 39 wherein said substrate is a collecting mold.
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) | 1993-10-01 | 1994-04-02 | 1994-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-01 | 1998-04-02 | 1998-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-01 | 2002-04-02 | 2002-10-02 | $7700.00 | Window Closed / Lapsed |