Pre-product and method for producing a strip-like high-temperature superconductor

Patent metadata

Field	Value
Publication number	US-10374139-B2
Application number	US-201515329846-A
Country	US
Kind code	B2
Filing date	Jul 23, 2015
Priority date	Jul 31, 2014
Publication date	Aug 6, 2019
Grant date	Aug 6, 2019

Abstract

The present invention relates to a precursor ( 1 ) for production of a high-temperature superconductor (HTS) in ribbon form, comprising a metallic substrate ( 10 ) in ribbon form having a first ribbon side ( 11 ) and a second ribbon side ( 12 ), wherein, on the first ribbon side ( 11 ), (a) the substrate ( 10 ) has a defined texture as template for crystallographically aligned growth of a buffer layer or an HTS layer and (b) an exposed surface of the substrate ( 10 ) is present or one or more layers ( 20,30 ) are present that are selected from the group consisting of: buffer precursor layer, pyrolyzed buffer precursor layer, buffer layer, HTS precursor layer, pyrolyzed HTS buffer precursor layer and pyrolyzed and further consolidated HTS buffer precursor layer, and, on the second ribbon side ( 12 ), at least one ceramic barrier layer ( 40 ) that protects the substrate ( 10 ) against oxidation or a precursor which is converted to such a layer during the HTS crystallization annealing or the pyrolysis is present, wherein, when one or more layers ( 20, 30 ) are present on the first ribbon side ( 11 ), the ceramic barrier layer ( 40 ) or the precursor thereof has a different chemical composition and/or a different texture than the layer ( 20 ) arranged on the first ribbon side ( 11 ) and directly adjoining the substrate ( 10 ). In this precursor, the barrier layer ( 40 ) is a layer that delays or prevents ingress of oxygen to the second ribbon side ( 12 ) and is composed of conductive ceramic material or a precursor which is converted to such a precursor during the HTS crystallization annealing or the pyrolysis, and the ceramic material is an electrically conductive metal oxide or an electrically conductive mixture of metal oxides, wherein the conductive metal oxide or one or more metal oxides in the conductive mixture is/are preferably metal oxide(s) doped with an extraneous metal.

First claim

The invention claimed is:

1. A precursor for production of a high-temperature superconductor (HTS) in ribbon form, comprising:
a metallic substrate in ribbon form having a first ribbon side and a second ribbon side,
wherein, on the first ribbon side,
(a) the substrate has a defined texture as template for crystallographically aligned growth of a buffer layer or an HTS layer
and
(b) an exposed surface of the substrate is present or one or more layers are present that are selected from the group consisting of: buffer precursor layer, pyrolyzed buffer precursor layer, buffer layer, HTS precursor layer, pyrolyzed HTS buffer precursor layer and pyrolyzed and further consolidated HTS buffer precursor layer,
and,
on the second ribbon side,
at least one ceramic barrier layer that protects the substrate against oxidation or a precursor which is converted to such a layer during the HTS crystallization annealing or the pyrolysis is present,
wherein, when one or more layers are present on the first ribbon side, the ceramic barrier layer or the precursor thereof has a different chemical composition and/or a different texture than the layer arranged on the first ribbon side and directly adjoining the substrate,
wherein
the barrier layer is a layer of conductive ceramic material that delays or prevents ingress of oxygen to the second ribbon side, or a precursor which is converted to such a layer during the HTS crystallization annealing or the pyrolysis,
and
the ceramic material is an electrically conductive metal oxide or an electrically conductive mixture of metal oxides.

2. The precursor according to claim 1 , wherein the conductive metal oxide or one or more metal oxides in the conductive mixture is/are metal oxide(s) doped with an extraneous metal.

3. The precursor according to claim 1 , wherein, on the first ribbon side,
a single buffer layer is present and the buffer layer has been grown on by epitaxial means
or
two or more buffer layers that have been grown on by epitaxial means are present.

4. The precursor according to claim 1 , wherein the metal oxide doped with an extraneous metal is selected from the group consisting of doped zinc oxide, doped indium oxide, niobium-doped strontium titanate, lanthanum nickelate and mixtures thereof.

5. The precursor according to claim 1 , wherein the doping level of the metal oxide doped with an extraneous metal is at least 1%, based on the total number of metal ions in the barrier layer.

6. A method for producing an HTS in ribbon form, comprising:
providing or producing a precursor according to claim 1 , wherein a pyrolyzed HTS precursor layer is present on the first ribbon side,
crystallization annealing of the precursor.

7. The method according to claim 6 , wherein the ceramic barrier layer is applied to the metallic substrate by a CSD (chemical solution deposition) method.

8. The method according to claim 7 , wherein the CSD method is selected from the group consisting of dip coating, slot die coating, printing ng combinations thereof.

9. The method according to claim 6 , comprising:
removing the ceramic barrier layer by a mechanical route.

10. The method according to claim 9 , wherein the ceramic barrier layer is removed by abrasion with a diamond suspension or by blast cleaning.

11. The method according to claim 10 , wherein the ceramic barrier layer is removed by CMP (chemical-mechanical polishing).

12. An HTS in ribbon form, obtainable by a method according to claim 6 .

Assignees

• Basf Se

Inventors

• Wojtyniak Brygida
• Weimann Viktor
• Baecker Michael
• Falter Martina

Classifications

• H01B12/06

  Films or wires on bases or cores · CPC title

• B05D7/14

  to metal, e.g. car bodies (involving a chemical reaction between the metal and the coating C23) · CPC title

• B05D1/18

  performed by dipping · CPC title

• H01B12/02

  characterised by their form · CPC title

• B05D1/265

  Extrusion coatings · CPC title