Method for preparing ferromagnetism-free and high-strength texture copper-nickel alloy composite substrate

Abstract

The invention discloses a method for preparing a ferromagnetism-free and high-strength texture copper-nickel alloy composite substrate. An initial raw material of a surface layer is a copper-nickel alloy which is prepared through a smelting method and the weight percentage of nickel in the copper-nickel alloy is smaller than 60%. An initial raw material of a core layer is a nickel-tungsten alloy which is prepared through the smelting method and the atom percentage content of tungsten in the nickel-tungsten alloy is 9%-12%. A composite billet with the outer layer being the copper-nickel alloy and the core layer being the nickel-tungsten alloy is prepared through explosive welding; then cold rolling is performed, the pass deformation of first three passes is 3%, the deformation of subsequent passes is 10%-20%, and cold rolling is conducted till the thickness reaches 30-40 micrometers; and finally, recrystallizing heat treatment through heat preservation at the temperature of 1000 DEG C for 30-90 minutes is adopted under a high-purity argon protective atmosphere to obtain the ferromagnetism-free, high-strength and strong cube texture copper-nickel alloy composite substrate. According to the method for preparing the ferromagnetism-free and high-strength texture copper-nickel alloy composite substrate, the large-size and large-area composite billet can be prepared through explosive welding, the preparation process is simple and low in cost, and the method is suitable for industrial production of the composite substrate.

Description

technical field [0001] The invention relates to a method for preparing a non-ferromagnetic, high-strength textured copper-nickel alloy composite substrate, and belongs to the technical field of textured metal substrates for strengthening high-temperature coating superconductors. Background technique [0002] The second-generation high-temperature coated superconducting materials represented by YBCO have attracted extensive attention from scholars at home and abroad due to their superior physical properties. RABiTS technology, that is, calendering-assisted biaxially textured substrate technology, is one of the main preparation routes for YBCO superconducting tapes, and the textured metal substrate used as YBCO coated conductor is the key to the preparation technology of RABiTS. At present, the preparation process of Ni5W alloy base strip is very mature, but because of its ferromagnetism in the liquid nitrogen temperature zone, it will cause hysteresis loss in the application ...

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Problems solved by technology

At present, the preparation process of Ni5W alloy base strip is very mature, but because of its ferromagnetism in the liquid nitrogen temperature zone, it will cause hysteresis loss in the application of alternating current; in addition, in order to improve the engineering current density of the superconducting strip, reduce the baseband At the same time, it also puts forward higher requirements on the mechanical strength of the base belt.

In order to solve the problem of ferromagnetism in the Ni5W alloy base strip, scholars at home and abroad have researched and prepared a non-ferromagnetic copper-nickel alloy composite base strip. Due to the low yield strength of the copper-nickel alloy composite base strip, it is still not an ideal texture for coated conductors. Metal baseband, in order to increase the mechanical strength of copper-nickel alloy composite baseband, preparing the composite baseband with non-magnetic copper-nickel alloy as the outer layer and high-strength nickel-tungsten alloy as the core layer is an effective way to improve the strength of copper-nickel alloy composite baseband. The strength and plastic deformation ability of nickel alloy and nickel-tungsten alloy are very different, and it is easy to cause cracking or delamination in the subsequent cold rolling process. a new challenge

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