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AssigneeLeibniz-Institut FüR FestköRper-Und Werkstoffforschung Dresden E.V.
InventorsJörg Eickemeyer, Dietmar Selbmann, Horst Wendrock, Bernhard Holzapfel
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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 >50% The product is softened by annealing at 500 to 850° 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.
A method for the production of a product on the basis of nickel, having a recrystallization cube texture, wherein first, a starting product is produced by way of a melt-metallurgy or powder-metallurgy process, with the inclusion of mechanical alloying, the starting product being produced by adding Ag into technically pure Ni or a Ni alloy so that the starting product has an Ag addition in a microalloying range of at least 10 atom ppm and maximally 1000 atom ppm, wherein this starting product is processed into strip or flat wire having an intermediate dimension, by hot-forming with subsequent cold-forming at >50% thickness reduction, this strip or flat wire is softened by annealing at a temperature within the temperature range between 500° C. and 850° C., whereby higher temperatures in the temperature range between 500° C. and 850° C. are used for higher Ag contents, thereupon quenching takes place, wherein subsequently, cold-forming occurs to a degree >80%, and wherein finally, recrystallizing annealing treatment is performed in order to achieve a complete cube texture.
Dependencies are inferred from the claim text.