Cu-Cr-Zr alloy preparation technology for contact wire

Abstract

The invention discloses a process for preparing Cu-Cr-Zr alloys applicable to contact lines. The process comprises the following steps that alloys comprising 0.30 to 0.50 percent of Cu, 0.10 to 0.15 percent of Cr, 0.01 to 0.02 percent of Zr and Si are melt in a vacuum induction furnace, wherein alloy elements, namely Cr, Zr and Si, are added by master alloys; fine casting-state crystal grains andoversaturated matrix tissues having secondary dendritic crystal spaces are obtained by controlling solidification velocity and cooling velocity; rolling in fit, drawing deformation and annealing thermal treatment to the fine casting-state crystal grains and oversaturated matrix tissues are carried out so as to control deformation degrees and parameters for the thermal treatment; and the strain-hardening effect and the precipitation strengthening effect are organically combined. Therefore, the alloys have the advantages of excellent tensile strength, electrical conductivity and high-temperatureresistant softening capacity and lower cost under the conditions of simplified process and the simpler apparatus and components, and are applicable to industrial production.

Description

technical field [0001] The invention relates to a copper-based alloy processing technology, in particular to a Cu-Cr-Zr alloy preparation process for contact wires. Background technique [0002] The function of the contact wire for electrified railway is to transmit current to the electric locomotive through direct contact with the sliding friction of the pantograph slide plate of the electric locomotive. Under severe conditions such as wear and tear, it is required that the contact wire material should have high tensile strength and electrical conductivity, as well as high resistance to high temperature softening. With the rapid development of railway electrification, the speed of railway transportation has been increased again and again, and the performance requirements for contact wires for electrified railways are getting higher and higher. However, the strength and conductivity of conductor alloys generally have an inverse function relationship, that is, if a specific ...

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Problems solved by technology

US6767643 and US6093499 disclose the preparation of Cu-(0.01~2.0)%Cr-(0.01~1.0)%Zr and Cu-(0.01~0.4)%Cr-(0.01~0.2)%Zr-(0.02~2.0)%Zn technology, the latter still needs to add auxiliary elements such as Fe, Ti, Ni, Sn, In, Mn, P, Mg, Al, B, As, Cd, Co, Te, Ag and Hf according to actual needs, which is only suitable for The foil used in the preparation of layered composite materials, the content range of alloying elements is too large or relatively complex, the performance is difficult to control, and the electrical conductivity is also low, only about 50% IACS

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