Preparation method of high-performance textured copper-nickel alloy composite base band for coated conductor

Abstract

The invention discloses a preparation method of a high-performance textured copper-nickel alloy composite base band for a coated conductor. The initial material of a surface layer is copper-nickel mixed powder (with code name of A) with the weight percentage content of nickel of 60%, and the initial material of a core layer is nickel-tungsten mixed powder (with code number of B) with the weight percentage content of tungsten of 9-10%. A preparation process comprises the following steps: filling the mixed powder A and B to a die layer by layer according to a sequence of A-B-A, carrying out cold isostatic pressing to prepare a three-layer initial composite blank with an outer layer being A and a core layer being B, firstly carrying out cold isostatic pressing on the initial composite blank, then carrying out compacting sintering by adopting cold isostatic pressing to obtain a layered copper-nickel alloy composite billet, and then carrying out large-deformation cold rolling on the layered copper-nickel alloy composite billet, wherein the pass deformation of the first five passes is 20-25%, the deformation of each subsequence pass is 3-10%, and the total deformation is 90%, and finally carrying out recrystallizing heat treatment with heat preservation of 50-90min at 900 DEG C, so as to obtain the non-magnetic copper-nickel alloy composite base band with high strength and strong cubic structure.

Description

technical field

[0001] The invention belongs to the technical field of textured metal substrates for reinforced high-temperature coating superconductors, and in particular relates to a preparation method for high-performance textured copper-nickel alloy composite substrates for coated conductors. Background technique

[0002] Since the discovery of the second-generation high-temperature superconducting materials represented by YBCO, it has attracted extensive attention from various research institutions around the world. In 1996, the Oak Ridge National Laboratory of the United States obtained a strong cubic texture after undergoing large-scale cold rolling of pure nickel and proper recrystallization heat treatment, which can be used as a tough metal texture substrate for high-temperature coated superconductor YBCO , this technique is called calender-assisted biaxially textured baseband technique. At present, the preparation process of Ni5W alloy baseband is very mature, but...

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