Karlsruher Institut Fur Technologie

Basf Se Corporation

Leibniz-Institut FÜr FestkÖrper-Und Werkstoffforschung Dresden E.v.

Institut Fuer Festkoerper-und Werkstoffforschung Dresden E.v.

Bernhard Holzapfel

Michael Baecker

Mathias Noe

Gunter Risse

Oliver Brunkahl

Bernd De Boer

Dietmar Selbmann

Thomas Freudenberg

Horst Wendrock

Victor Manuel Rodriguez Zermeno

Jörg Eickemeyer

A rail-bound maglev train comprising a guide rail which predefines a travel path, having at least one supra-conductive element () and a levitating vehicle which is arranged on the guide rail and has magnetic means (), wherein the magnetic means interact magnetically in a contactless fashion with the travel path, and at least one supra-conductive element () comprises at least one supra-conductive conductor parallel to the travel path (), and the at least one supra-conductive conductor has at least two electrical connections, wherein the respective at least two connections bound, on a strip, a strip section, arranged between said connections, as a continuous supra-conductive electrical line.

Rail-bound maglev train

The present invention relates to a method and an apparatus for producing superconducting devices and to superconducting devices. The method comprises determining one or more regions of reduced critical current density in the superconducting device and modifying the critical current density in the one or more regions of reduced critical current density, so as to increase the overall critical current or to decrease the overall AC losses of the superconducting device. The modifying comprises modifying the amount and/or distribution of the superconducting material in the one or more regions of reduced critical current density; and/or modifying the chemical composition of the superconducting material in the one or more regions of reduced critical current density; and/or decreasing the cooling temperature in the one or more regions of reduced critical current density. A superconducting device formed according to such method can also be provided.

Superconducting devices by optimization of the superconductor's local critical current

Known processes for the production of nanoparticles of compounds of the transition metals Zr, Ti, Ta, rare earths (RE), Mn, and Fe via microemulsions lead to products that contain impurities from the reactants, particularly water, which make the further use of said nanoparticles difficult, for instance in high-temperature super conductors (HTSC). It is proposed that the nanoparticles be produced via anhydrous microemulsions having an outer phase composed of a nonpolar solvent and inner phase composed of a polar anhydrous solvent. The nanoparticles thus obtained exhibit good monodispersity and can be used in the production of REBaCuOsuper conductors by incorporation into the precursor coating solution.

Process for producing nanoparticles and their use in the production of high-temperature superconductors

A nickel-based semi-finished product, for making a high-temperature superconductor, embodied in the form of a strip or flat wire is produced and used as a base for physical-chemical coatings provided with a high-quality intense microstructural orientation. The semi-finished product has an improved granular structure provided with a stable cube texture. A fusion or powder metallurgy process including mechanical alloys makes a semi-finished product including a technically pure Ni or Ni alloy containing an Ag additive in a specified microalloy range. The product is shaped as a strip or flat wire by hot- and cold forming processes with a thickness reduction &#x3e;50% The product is softened by annealing at 500 to 850&#xb0; C. and is subsequently quenched. Afterwards, the product is exposed to the 80% cold shaping. A recrystallization annealing treatment is carried out to obtain an entire cubic texture.

Method for the production and use of semi-finished products on the basis of nickel, having a recrystallization cube texture

The aim of the invention is to provide a metal strip for epitaxial coating with a biaxially textured layer, this metal strip, however, being able to be produced in an uncomplicated manner and having a high tensile strength, low magnetic losses and/or a high electrical conductivity. According to the invention, the metal strip is comprised of Nj, Cu, Ag or alloys thereof all serving as basic material, whereby the one-layer metal strip and, in the instance of a multilayer metal strip, at least one of its layers contains 10 nm to 5 &#x3bc;m large, strength-increasing dispersoids comprised of carbides, borides, oxides and/or nitrides with a volume proportion ranging from 0.1 to 5%. In the instance of a multilayer metal strip, the layers form a composite, and at least one of the layers does not contain any dispersoids and has a biaxial texture. For the production, a starting material is used, which is comprised of Ni, Cu, Ag or of alloys thereof all serving as basic material and which contains 0.2 to 5 atom percent of an additive comprised of oxidizable, nitridable, boridable and/or carbidable elements. A one-layer or a multilayer strip is produced from this starting material by means of deforming methods, whereby for producing the multilayer metal strip, a basic material that does not contain the aforementioned additive is used as one of its layers. Afterwards, the strip is subjected to a recrystallization annealing in order to form a cubical texture. Finally, the strip is subjected to an annealing under an oxygen, nitrogen, boron or carbon partial pressure, which is greater than the equilibrium partial pressure of oxides, nitrides, borides and carbides of the additive elements contained in the alloy, but is less than the equilibrium partial pressure of oxides, nitrides, borides and carbides of the basic elements Ni, Cu and Ag of the strip alloy.

Metal strip for epitaxial coatings and method for the production thereof

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Kreischa, Germany

Bernhard Holzapfel