Patent EP0339801A1 successfully refreshed from Google Patents.
EP0339801A1
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Superconductive ceramics laminates and method for production thereof
Assignee: National Institute for Materials Science
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Filing: 1989-03-30
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Granted: —
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Expires: 2009-03-30
Abstract
Abstract A method for making superconductive ceramics laminates comprises forming a thick film (2) of a composite oxide comprising bismuth, strontium, calcium, copper and oxygen on a flat plane of a substrate (1), and orienting and crystallizing the thus formed film by heat treatment to cause the c-axis of composite oxide crystals to be substantially perpendicular to said flat plane of said substrate. An intermediate layer formed of a noble metal, MgO, SrTiO₃, yttria-stabilized zirconia or an oxide of a superconductive ceramics-constituting element may be interposed between the film and the substrate.
Inventors
- 👤 Kazutomo Hoshino
- 👤 Shigeru Yamazaki
- 👤 Hidefusa Takahara
- 👤 Masao Fukutomi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 02:39
CPC Classifications
B; B32; B32B; B32B18/00; C; C04; C04B; C04B35/00; C04B35/01; C04B35/45; C04B35/4521; C04B37/00; C04B37/02; C04B37/021; H; H10; H10N; H10N60/00; H10N60/01; H10N60/0268; H10N60/0296; H10N60/0576; H10N60/0632; C04B2235/00; C04B2235/65; C04B2235/656; C04B2235/6565; C04B2235/6567; C04B2237/00; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/40; C04B2237/408; C04B2237/50; C04B2237/70; C04B2237/704; C04B2237/706; Y; Y10; Y10S; Y10S505/00; Y10S505/725; Y10S505/739; Y10S505/741; Y10S505/742
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
62 words
A method for producing superconductive ceramics laminates wherein: a thick film of a composite oxide comprising bismuth, strontium, calcium, copper and oxygen is formed on a flat plane of a substrate, and the thus formed film is oriented and crystallized by heat treatment to cause the c-axis of composite oxide crystals to be substantially perpendicular to said flat plane of said substrate.
Claim 2
Independent Claim
62 words
A method for producing superconductive ceramics laminates wherein: a thick film of a composite oxide comprising bismuth, strontium, calcium, copper and oxygen is formed on a flat plane of a substrate, and the thus formed film is oriented and crystallized by heat treatment to cause the c-axis of composite oxide crystals to be substantially perpendicular to said flat plane of said substrate.
Claim 3
Dependent Claim
20 words
A method as claimed in Claim 1, wherein said substrate is a good conductor in the form of a tape.
Claim 4
Dependent Claim
29 words
A method as claimed in Claim 2, wherein said substrate is formed of a metal selected from the group consisting of silver, copper, gold, platinum, nickel and their alloys.
Claim 5
Dependent Claim
43 words
A method as claimed in Claim 1, wherein said heat treatment of said film is carried out by heating said film to a temperature of 860 to 950°C to melt a part or the whole thereof, after which the film is gradually cooled.
Claim 6
Dependent Claim
75 words
A superconductive ceramics laminate which is obtained by forming a film of a composite oxide ceramics comprising bismuth, strontium, calcium, copper and oxygen on a flat plane of a metal substrate formed of a metal selected from the group consisting of silver, copper, gold, platinum, nickel, and their alloys, and in which composite oxide crystals in said film are oriented to cause their c-axis to be substantially perpendicular to said flat plane of said substrate.
Claim 7
Dependent Claim
75 words
A superconductive ceramics laminate which is obtained by forming a film of a composite oxide ceramics comprising bismuth, strontium, calcium, copper and oxygen on a flat plane of a metal substrate formed of a metal selected from the group consisting of silver, copper, gold, platinum, nickel, and their alloys, and in which composite oxide crystals in said film are oriented to cause their c-axis to be substantially perpendicular to said flat plane of said substrate.
Claim 8
Dependent Claim
19 words
A superconductive ceramics laminate as claimed in Claim 5, wherein said substrate is in the form of a tape.
Claim 9
Independent Claim
92 words
A method for producing superconductive ceramics laminates which comprises forming a thick film of a composite oxide comprising bismuth, strontium, calcium, copper and oxygen on a plane of a substrate over an intermediate layer and heat-treating the thus formed film, wherein: composite oxide crystals are oriented and crystallized by said heat treatment to cause their c-axis to be substantially perpendicular to a flat plane of said intermediate layer, and said intermediate layer serves to promote said orientation and has no adverse influence upon the superconductivity of the ceramics during said heat treatment.
Claim 10
Independent Claim
92 words
A method for producing superconductive ceramics laminates which comprises forming a thick film of a composite oxide comprising bismuth, strontium, calcium, copper and oxygen on a plane of a substrate over an intermediate layer and heat-treating the thus formed film, wherein: composite oxide crystals are oriented and crystallized by said heat treatment to cause their c-axis to be substantially perpendicular to a flat plane of said intermediate layer, and said intermediate layer serves to promote said orientation and has no adverse influence upon the superconductivity of the ceramics during said heat treatment.
Claim 11
Dependent Claim
24 words
A method as claimed in Claim 7, wherein said substrate is a heat-resistant metal or a high-strength alloy in the form of a tape.
Claim 12
Dependent Claim
35 words
A method as claimed in Claim 7, wherein said intermediate layer is formed of a metal selected from silver, copper, gold and platinum, MgO, SrTiO₃, yttria-stabilized zirconia or an oxide of a superconductive ceramics-constituting element.
Claim 13
Dependent Claim
44 words
A method as claimed in Claim 7, wherein said heat treatment of said film is carried out by heating said film to a temperature of 860 to 950°C to melt a part or the whole thereof, which step is then followed by gradual cooling.
Claim 14
Dependent Claim
82 words
A superconductive ceramics laminate in which: a film of a superconductive composite oxide ceramics comprising bismuth, strontium, calcium, copper and oxygen is formed on a flat plane of a substrate over an intermediate layer formed of a metal selected from silver, copper, gold and platinum, MgO, SrTiO₃, yttria-stabilized zirconia or an oxide of a superconductive ceramics-constituting element, and composite oxide crystals in said film are orientated to cause their c-axes to be substantially perpendicular to a flat plane of said intermediate layer.
Claim 15
Dependent Claim
82 words
A superconductive ceramics laminate in which: a film of a superconductive composite oxide ceramics comprising bismuth, strontium, calcium, copper and oxygen is formed on a flat plane of a substrate over an intermediate layer formed of a metal selected from silver, copper, gold and platinum, MgO, SrTiO₃, yttria-stabilized zirconia or an oxide of a superconductive ceramics-constituting element, and composite oxide crystals in said film are orientated to cause their c-axes to be substantially perpendicular to a flat plane of said intermediate layer.
Claim 16
Dependent Claim
19 words
A superconductive ceramics laminate as claimed in Claim 11, wherein said substrate is in the form of a tape.
Claim 17
Dependent Claim
31 words
A superconductive ceramics laminate as claimed in Claim 12, wherein said substrate is selected from the group consisting of a heat-resistant metal and their alloy, ceramics and a metal/ceramics composite material.
References Cited (Backward Citations)
EP0244993A2
Cited
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