Preparation method of high-strength high-conductivity copper-niobium multi-core composite wire

Abstract

The invention provides a preparation method of a high-strength high-conductivity copper-niobium multi-core composite wire. The preparation method comprises the following steps that 1, oxygen-free copper foil and niobium foil are stacked in order and wound around an oxygen-free copper bar to obtain a copper-niobium winding body, then, the copper-niobium winding body is installed in a first oxygen-free copper tube, and a copper-niobium composite sleeve is obtained after seal welding; 2, isostatic cool pressing forming is carried out, and a copper-niobium pressed formed part is obtained; 3, hot extrusion machining is carried out to obtain a copper-niobium extrusion bar billet; 4, multi-pass drawing machining is carried out to obtain a copper-niobium single-core wire; 5, sizing, shearing, straightening and acid pickling treatment are carried out in sequence; 6, bundling assembling is carried out to prepare a copper-niobium bundle sleeve, the steps 2-5 are repeatedly executed, and the high-strength high-conductivity copper-niobium multi-core composite wire is obtained. The initial machining size of a niobium core wire can be lowered, the machining hardness of materials is reduced, the machining period is shortened, and the preparation method is the novel method for preparing the high-strength high-conductivity copper-niobium multi-core composite wire.

Description

technical field [0001] The invention belongs to the technical field of high-performance copper-based composite materials, and in particular relates to a method for preparing high-strength and high-conductivity copper-niobium multi-core composite wires. Background technique [0002] High-strength and high-conductivity copper-niobium composite materials are the main conductor materials for pulsed strong magnetic fields. The rapid improvement of material strength and electrical conductivity has brought about continuous refreshment of high-field pulsed magnet records. With the rapid development of international pulse magnet technology, more stringent requirements have been put forward for materials; at the same time, my country's pulsed strong magnetic field centers have also shown greater demand for materials in the rapid development of recent years. [0003] At present, high-strength and high-conductivity copper-niobium composite wires are mainly prepared by cluster drawing an...

AI Technical Summary

Problems solved by technology

[0004] To sum up, the characteristics of the above two methods are to realize the complete nanofibrillation of the internal niobium core wire through cluster drawing processing. The pure cluster drawing technology requires multiple cluster composite processing, which has a long processing cycle and high cost. The large amount of deformation and obvious hardening of the material when the macroscopic size is processed to the nanometer size have brought many difficulties to the preparation of the material; while the in-situ method clustering requires three to four times of electric arc furnace melting, which requires a lot of smelting equipment and smelting expertise. The level requirements are high, and the impurities introduced by the smelting process also have a great impact on the conductivity of the material