Preparation method for non-ferromagnetic textured nickel tungsten/ nickel vanadium/ nickel tungsten composite substrate

Abstract

The invention discloses a preparation method for a non-ferromagnetic textured nickel tungsten / nickel vanadium / nickel tungsten composite substrate. The method comprises the steps that the oxide skin of the surface of a nickel tungsten alloy which is obtained by smelting and contains tungsten with an atomic percentage of 9.5%-11% serves as an outer material of a composite billet after the oxide skin is burnished, nickel-vanadium mixed powder which is obtained by ball milling and contains vanadium with an atomic percentage of 10% serves as a core material of the composite billet, the nickel tungsten alloy and the nickel-vanadium mixed powder are placed in a mould according to the nickel tungsten- nickel vanadium- nickel tungsten order, and a nickel tungsten / nickel vanadium / nickel tungsten composite billet is prepared by spark plasma sintering technology; the nickel tungsten / nickel vanadium / nickel tungsten composite billet is subjected to large-deformation cold rolling, wherein the pass deformation is 10%-15%, the total deformation is 99.5%-99.9%, finally thermal insulation is conducted for 200 min at 1250-1350 DEG C under the protection of nitrogen, and then a non-ferromagnetic and high-strength nickel tungsten / nickel vanadium / nickel tungsten composite substrate with a high-cube texture is obtained after crystallization and heat treatment. The nickel tungsten / nickel vanadium / nickel tungsten composite substrate has no ferromagnetic property, is high in mechanical strength and has a high-cube texture.

Description

technical field [0001] The invention belongs to the technical field of metal substrates for high-temperature coated superconducting strips, and in particular relates to a preparation method of a non-ferromagnetic textured nickel-tungsten / nickel-vanadium / nickel-tungsten composite substrate. Background technique [0002] Because the second-generation high-temperature superconducting tape has superior performance than the first-generation bismuth-based superconducting materials, it is expected to realize its application in strong electric fields such as superconducting transformers, superconducting motors and superconducting current limiters. The preparation of high-performance metal substrates is the key to obtaining high-performance coated superconductors. Among the various metal alloy substrates used in coated conductors, nickel-tungsten alloy substrates are one of the most systematic and in-depth researched substrate materials. At present Ni5at.%W (Ni5W) alloy base strip ha...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcoming of poor oxidation resistance of nickel-vanadium / nickel-tungsten / nickel-vanadium composite baseband, and provide a non-ferromagnetic textured nickel-tungsten / nickel-vanadium by rationally designing the interlayer structure and process route of the composite baseband / Preparation method of nickel-tungsten composite substrate

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