EP1027737A1 - Structure supraconductrice comportant un substrat de verre sur lequel est depose un supraconducteur haute temperature, et procede de production de cette structure - Google Patents

Structure supraconductrice comportant un substrat de verre sur lequel est depose un supraconducteur haute temperature, et procede de production de cette structure

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Publication number
EP1027737A1
EP1027737A1 EP98961034A EP98961034A EP1027737A1 EP 1027737 A1 EP1027737 A1 EP 1027737A1 EP 98961034 A EP98961034 A EP 98961034A EP 98961034 A EP98961034 A EP 98961034A EP 1027737 A1 EP1027737 A1 EP 1027737A1
Authority
EP
European Patent Office
Prior art keywords
superconductor
structure according
glass
substrate
superconductor structure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP98961034A
Other languages
German (de)
English (en)
Inventor
Rainer Nies
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP1027737A1 publication Critical patent/EP1027737A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N60/00—Superconducting devices
    • H10N60/30—Devices switchable between superconducting and normal states
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N60/00—Superconducting devices
    • H10N60/01—Manufacture or treatment
    • H10N60/0268—Manufacture or treatment of devices comprising copper oxide
    • H10N60/0296—Processes for depositing or forming copper oxide superconductor layers
    • H10N60/0576—Processes for depositing or forming copper oxide superconductor layers characterised by the substrate

Definitions

  • the invention relates to a superconductor structure with a substrate, at least one buffer layer deposited on the substrate and a layer deposited on the buffer layer made of a metal-oxide superconductor material with a high transition temperature, the substrate consisting of a glass material which has a maximum temperature during manufacture the buffer layer and the superconductor layer are sufficiently temperature-resistant.
  • the invention further relates to a method for producing a corresponding superconductor structure.
  • Such a structure and a corresponding manufacturing process can be found in "Physica C", Vol. 261, 1996, pages 355 to 360.
  • Jump temperatures T of over 77 K are known, which are therefore also referred to as high-T r superconductor materials or HTS materials and in particular allow an LN 2 cooling technology.
  • Such metal oxide compounds include, in particular, cuprates of special material systems such as, for example, the types Y-Ba-Cu-0 or Bi-Sr-Ca-Cu-O, where the Bi component can be partially substituted by Pb.
  • Several superconducting high-T c phases can occur within individual material systems, which differ in the number of copper-oxygen network planes or layers within the crystalline unit cell and which have different transition temperatures.
  • HTS materials are attempted to be deposited on different substrates for different applications. the, whereby in general the phase-pure superconductor material is sought.
  • metallic substrates are particularly provided for conductor applications.
  • DE 195 20 205 ⁇ generally shows the use of substrates made of glass material as carriers for conductor tracks made of HTS material with current limiting devices.
  • a buffer layer suitable for this purpose on the surface of the substrate to be coated with the HTS material.
  • the object of the present invention is therefore to design the superconductor structure with the features mentioned at the outset and the method for its production in such a way that comparatively higher critical current densities can be obtained.
  • the glass material of the superconductor structure according to the invention should have a coefficient of thermal expansion which is greater than 6 10 ⁇ 6 K "1 , and a transformation temperature of over 550 ° C.
  • the invention is based on the knowledge that the (linear) thermal expansion coefficient of the glass material to be regarded as "soft glass” together with the transformation temperature, which is important with regard to the maximum temperature required for the deposition or formation of the superconducting material, the decisive factor with regard to a high critical current density is J. C. If the glass material is selected with the claimed values of the expansion coefficient and the transformation temperature, then crack formation in the HTS material, as is known in the known superconductor structure, can advantageously be carried out observed according to the cited reference "Physica C", at least largely avoided. Because the claimed value of the expansion coefficient is that of the HTS material, which is of the order of magnitude
  • 10 10 "6 K " 1 lies, at least largely adapted.
  • a glass material with an expansion coefficient of over 7 10 ⁇ 6 K _1 can therefore be regarded as particularly advantageous.
  • the measuring range for the mentioned values of the expansion coefficients usually extends from 20 ° C to 300 ° C.
  • Glazers suitable as substrate material are relatively inexpensive, so that they can be used in particular for large-area substrates with a coatable area of at least 10 cm 2 , preferably over 100 cm 2 , as are to be provided in particular for current limiting devices. In such facilities, a total area of HTS material of more than 2 m 2 is required for a power to be limited of, for example, about 10 MVA.
  • Special aluminosilicate glasses can advantageously be selected as the glass material, since they can best meet the required combination of glass properties.
  • a glass material preferably has about 50 to 70% by weight of SiO 2 and about 10 to 30% by weight of Al? 0 3 , the values mentioned being able to deviate by ⁇ 5%.
  • the glass material used advantageously has cerium, in particular in the form of a cerium oxide additive. With such an addition, the transformation temperature of the glass material can be increased to a certain extent.
  • At least one deposition process for the material of the buffer layer and / or the superconductor layer is advantageously chosen for the production of a corresponding structure, in which the maximum temperature at the substrate is at most 100 K higher, preferably at most 50 K higher than the transformation temperature of the glass material. In this way, dimensional stability, in particular of large-area substrates, can advantageously be ensured.
  • the superconductor structure according to the invention can be provided particularly advantageously for devices in which large-area substrate surfaces of preferably at least 10 cm 2 , in particular over 100 cm 2, serve as the substrate for the HTS material.
  • a corresponding device is, for example, a short-circuit current limiter device with a planar conductor configuration, the basic embodiment of which is generally known (cf., for example, the aforementioned DE 195 20 205 A or EP 0 523 374 A).
  • Current limiter devices of this type in particular require substrate surfaces of up to over 2000 cm 2 .
  • the use of special glasses as large-area substrates enables then light a relatively inexpensive manufacture of the corresponding superconductor structure.
  • a section of a cross section through a conductor structure of such a short-circuit current limiter device is shown in the figure.
  • the structure generally designated 2
  • a layer 5 made of an HTS material is deposited on the buffer layer, which can be structured if necessary.
  • the HTS layer 5 can be combined with at least one further layer such as e.g. a protective layer or a layer 6 serving as a shunt resistor.
  • a shunt resistance layer is particularly advantageous for current limiter applications.
  • a plate with a thickness di of a few millimeters and with the required area made of a special flat glass is used, which is preferably drawn from the melt and, if appropriate, is then thermally leveled. In thermal leveling, small waves and other unevenness are smoothed out by heating the surface. The fused surface then has a sufficiently low micro-roughness for the subsequent coating processes.
  • the roughness determined by the maximum roughness depth R t should advantageously be less than 50 nm, preferably less than 20 nm, based on a measuring path of 500 ⁇ .
  • a glass material should be selected for the substrate which, on the one hand, has a sufficiently high transformation temperature of at least 550 ° C., preferably of at least 580 ° C., with reference to the maximum temperature (at the substrate) that occurs in the subsequent deposition processes.
  • the transformation temperature should only be at most 100 ° C below this maximum temperature of the process.
  • the temperature of the deposition process lies between the transformation temperature and the softening temperature of the glass material.
  • the glass material should have a linear coefficient of thermal expansion in a usual temperature range between 20 ° and 300 ° C, which is greater than 6 10 ⁇ 6 K "1 and in particular is above 7 10 " 6 K _1 .
  • aluminum silicate glasses which in particular contain about 50 to 70% by weight SiO 2 and 10 to 30% by weight A1 2 0 3 in addition to other components.
  • a suitable aluminum silicate glass is a glass from the company "Deutsche Spezialglas AG",
  • This glass which belongs to the category of safety glass and which, for example, and space travel, which is used in the lighting and window industry as well as for glasses and watch glasses as well as for substrates for photomasks, has a thermal expansion coefficient of 8.9 10 "6 K _1 at a softening temperature of 870 ° C and a transformation temperature of 607 ° C on. It was recognized that this glass material can serve particularly advantageously as a large-area substrate material for HTS layers, in particular for current limiting devices.
  • glass materials known as flat glass which are known per se, are also suitable as starting materials which, although they have the required coefficient of thermal expansion, but whose transformation temperature is too low, by adding cerium in the form of CeO 2 between 0.5 to 40% by weight , in particular between 1 and 30% by weight of the known material such as, for example, an aluminum silicate, the transformation temperature can then be raised to the required value.
  • the at least one buffer layer must consist of a material that ensures such growth.
  • a layer 4 with a texture adapted to the crystalline dimensions of the HTS material is therefore particularly suitable.
  • Biaxially textured, yttrium-stabilized zirconium oxide (abbreviation: "YSZ”) is advantageous.
  • buffer layer materials such as Ce0 2 , YSZ + Ce0 2 (as a double layer), Pr 6 0n, MgO, YSZ + tin-doped ln 2 0 3 (as a double layer), SrT ⁇ 0 3 or La ⁇ - x Ca x Mn0 3.
  • IBAD process .Ion Beam-assisted deposition methods
  • the layer thickness d 2 of the textured buffer layer 4 thus produced generally being between 0.05 and 2 ⁇ m.
  • the HTS material is then generally coated on the buffer layer 4 with the aid of known deposition processes while heating the substrate to a thickness d 3 Applied micrometers.
  • the minimum thickness of d 3 is expediently at least 0.2 ⁇ m, in particular at least 0.5 ⁇ m.
  • maximum thicknesses of d 3 of 5 ⁇ m, preferably of at most 3 ⁇ m, are sufficient for this application.
  • a method is advantageously selected for the deposition of the HTS material which requires a maximum temperature for the deposition and for the formation of the HTS material which is at most 100 ° higher, preferably at most 50 ° C higher than the required transformation temperature of the selected one Glass material.
  • the deposition or formation temperature should be at least 100 ° C lower than the softening temperature of the glass material.
  • the latter method can advantageously be carried out at relatively low substrate temperatures of about 650 ° C.
  • CVD (Chemical Vapor Deposition) processes, in particular using metal-organic starting materials, are also suitable.
  • TlBa 2 Ca 2 Cu 3 0 come as HTS materials 9 + x , HgBa 2 CaCu 2 0 6 + x , Bi 2 Sr 2 CaCu 2 0 8 - x or (Bi, Pb) 2 Cr 2 Ca 2 Cu 3 0 ⁇ 1 _ x in question.
  • a glass substrate 3 made of the known aluminosilicate glass with the product designation “SG-11” with a thickness di of approximately 2 mm and an extension of its surface of 10 10 cm 2 selected.
  • thermal co-evaporation of the components of the material with the supply of oxygen at a substrate temperature of 620 ° to 650 ° C. was provided by means of a known coating apparatus.
  • the HTS layer 5 was then covered with a 0.5 mm thick Au shunt resistance layer 6.
  • the HTS layer of structure 2 then had a critical current density J c (in the zero field, at 77 K, with 0.1 ⁇ V / cm as a characteristic of the critical current I c ) of over 5 10 5 A / cm 2 .
  • the superconductor material should only be on one side of the substrate.
  • coating on both sides is also possible (see e.g.
  • EP 0 731 986 B1 Such an embodiment is particularly advantageous from the point of view of minimizing mechanical stresses in the substrate.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Superconductor Devices And Manufacturing Methods Thereof (AREA)
  • Inorganic Compounds Of Heavy Metals (AREA)
  • Surface Treatment Of Glass (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Containers, Films, And Cooling For Superconductive Devices (AREA)

Abstract

L'invention concerne une structure supraconductrice (2) qui comporte un substrat (3) consitué d'un verre résistant aux températures élevées, une couche tampon (4) déposée sur le substrat, ainsi qu'une couche (5) déposée sur celle-ci est constituée d'un matériau supraconducteur à température de transition élevée, à oxyde de métal. Il faut utiliser un verre présentant un coefficient de dilatation thermique supérieur à 6 . 10 <-6> K<-1> et une température de transformation supérieure à 550 DEG C. Pour produire la structure selon l'invention, on sélectionne au moins un procédé de dépôt, selon lequel la température maximale dépasse, au maximum, de 100 K, la température de transformation du verre.
EP98961034A 1997-10-29 1998-10-23 Structure supraconductrice comportant un substrat de verre sur lequel est depose un supraconducteur haute temperature, et procede de production de cette structure Withdrawn EP1027737A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19747767 1997-10-29
DE19747767 1997-10-29
PCT/DE1998/003116 WO1999022412A1 (fr) 1997-10-29 1998-10-23 Structure supraconductrice comportant un substrat de verre sur lequel est depose un supraconducteur haute temperature, et procede de production de cette structure

Publications (1)

Publication Number Publication Date
EP1027737A1 true EP1027737A1 (fr) 2000-08-16

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP98961034A Withdrawn EP1027737A1 (fr) 1997-10-29 1998-10-23 Structure supraconductrice comportant un substrat de verre sur lequel est depose un supraconducteur haute temperature, et procede de production de cette structure

Country Status (5)

Country Link
US (1) US6309767B1 (fr)
EP (1) EP1027737A1 (fr)
JP (1) JP2001521298A (fr)
CA (1) CA2309086A1 (fr)
WO (1) WO1999022412A1 (fr)

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US6765151B2 (en) * 1999-07-23 2004-07-20 American Superconductor Corporation Enhanced high temperature coated superconductors
US6828507B1 (en) * 1999-07-23 2004-12-07 American Superconductor Corporation Enhanced high temperature coated superconductors joined at a cap layer
DE10159646C1 (de) * 2001-12-05 2003-04-17 Siemens Ag Verfahren zur nur einseitigen Beschichtung eines planaren Substrats mit einer Schicht aus Hochtemperatur-Supraleiter-Material
US6764770B2 (en) * 2002-12-19 2004-07-20 Ut-Battelle, Llc Buffer layers and articles for electronic devices
US7774035B2 (en) * 2003-06-27 2010-08-10 Superpower, Inc. Superconducting articles having dual sided structures
US20040266628A1 (en) * 2003-06-27 2004-12-30 Superpower, Inc. Novel superconducting articles, and methods for forming and using same
US7025826B2 (en) * 2003-08-19 2006-04-11 Superpower, Inc. Methods for surface-biaxially-texturing amorphous films
KR100586570B1 (ko) 2004-11-25 2006-06-07 엘에스전선 주식회사 크랙 방지 구조를 갖는 초전도 선재
US20080257517A1 (en) * 2005-12-16 2008-10-23 General Electric Company Mold assembly for use in a liquid metal cooled directional solidification furnace
US7627356B2 (en) * 2006-07-14 2009-12-01 Superpower, Inc. Multifilament AC tolerant conductor with striated stabilizer and devices incorporating the same
US8716188B2 (en) 2010-09-15 2014-05-06 Superpower, Inc. Structure to reduce electroplated stabilizer content
US9564258B2 (en) 2012-02-08 2017-02-07 Superconductor Technologies, Inc. Coated conductor high temperature superconductor carrying high critical current under magnetic field by intrinsic pinning centers, and methods of manufacture of same
US9362025B1 (en) 2012-02-08 2016-06-07 Superconductor Technologies, Inc. Coated conductor high temperature superconductor carrying high critical current under magnetic field by intrinsic pinning centers, and methods of manufacture of same
WO2019224830A1 (fr) * 2018-05-24 2019-11-28 Guy Deutscher Limiteur de courant de défaut

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US4994435A (en) * 1987-10-16 1991-02-19 The Furukawa Electric Co., Ltd. Laminated layers of a substrate, noble metal, and interlayer underneath an oxide superconductor
JP2639961B2 (ja) * 1988-03-25 1997-08-13 三洋電機株式会社 超電導素子の製造方法
JPH0227614A (ja) 1988-07-15 1990-01-30 Nippon Sheet Glass Co Ltd 酸化物超伝導薄膜の積層構造
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DE4119984A1 (de) 1991-06-18 1992-12-24 Hoechst Ag Resistiver strombegrenzer
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Also Published As

Publication number Publication date
US6309767B1 (en) 2001-10-30
JP2001521298A (ja) 2001-11-06
CA2309086A1 (fr) 1999-05-06
WO1999022412A1 (fr) 1999-05-06

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