Basf Se Corporation

Zenergy Power Gmbh

Martina Falter

Michael Baecker

Barbara Schüpp-Niewa

Kerstin Knoth

Brigitte Schlobach

Michael Bäcker

Oliver Brunkahl

Brygida Wojtyniak

Oliver Thiems

Bernhard Holzapfel

Michael Backer

Ruben Huhne

Viktor Weimann

Jan Kunert

Ruben Hühne

Ruben Huehne

Barbara Schuepp-Niewa

The present invention relates to 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 (). In this precursor, the barrier layer () is a layer that delays or prevents ingress of oxygen to the second ribbon side () 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.

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

The invention relates to a method for producing a composite comprising a high-temperature superconductor (HTS) layer based on rare earth metal-barium-copper oxide on a substrate with defined biaxial texture, having the following steps: applying a first HTS coating solution to the substrate, drying the first HTS coating solution to produce a first film, pyrolyzing the first film to produce a first pyrolyzed sublayer, removing an interfacial layer on the upper side of the first pyrolyzed sublayer to produce a first pyrolyzed sublayer with reduced layer thickness, applying a second HTS coating solution to the first pyrolyzed sublayer with reduced layer thickness, drying the second HTS coating solution to produce a second film, pyrolyzing the second film to produce a second pyrolyzed sublayer, optionally forming one or more further pyrolyzed sublayers on the second pyrolyzed sublayer, and crystallizing the overall layer formed from the pyrolyzed sublayers to complete the HTS layer, wherein the removal of the interfacial layer in step D) is effected in such a way that a texture determined by the defined biaxial texture of the substrate is transferred to the first and also to the second pyrolyzed sublayer, and also to a product producible by such a method.

Method for producing a composite comprising a high-temperature superconductor (HTS) layer

A high-temperature superconductor layer arrangement includes at least one substrate and one textured buffer layer made of oxidic material. The buffer layer displays at least one further constituent forming a homogeneous mixed-crystal layer. The further constituent is a transition metal from the first subgroup and/or forming at least a partial melt with the oxidic buffer material at an annealing temperature of &#x2266;1,600 degrees Celsius. The further constituent can particularly be copper and/or silver.

High-temperature superconductive layer arrangement

A wet-chemical method for producing strip-shaped high-temperature superconductors with a substrate, optionally with a buffer layer and with a high-temperature superconductive layer is improved by increasing the texturing and the layer thickness of the high-temperature superconductive layer. To this end, precursor solutions are applied in layers to the substrate, of which the first is low in fluorine or does not contain fluorine, and the following have a fluorine concentration that increases with each layer.

Process for the production of highly-textured, band-shaped, high-temperature superconductors

The formation of band-shaped HTSL on a metal substrate is disclosed. The HTSL includes at least one buffer layer comprising zirconates and/or rare-earth oxides. The HTSL layer is formed on the buffer layer. The buffer layer has a texturing that in the case of a RHEED measurement results in discrete reflexes and not only in diffraction rings. In particular, the buffer layer may be textured along its interface with the HTSL layer.

Growing community of inventors

Swisttal-Buschhoven, Germany

Martina Falter