Preparation method of super-strong high-conductivity copper alloy serving as contact line material of high-speed railway with speed per hour being above 400 kilometers

A technology of copper alloy and master alloy, which is applied in the field of Cu alloy preparation, can solve the problems of not being able to meet the minimum requirements of the contact wire material performance, and achieve the effect of preventing the spheroidization trend, reducing the scattering effect, and improving the overall strength level

Active Publication Date: 2016-11-09
ZHEJIANG UNIV
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Problems solved by technology

Such stringent performance standards make the currently used Cu-Mg, Cu-Sn, Cu-Ag, Cu-Sn-Ag, Cu-Ag-Zr, Cu-Cr-Zr alloys unable to meet the high-speed requirements of more than 400 kilometers per hour. Minimum requirements for the properties of contact wire materials for railway systems

Method used

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  • Preparation method of super-strong high-conductivity copper alloy serving as contact line material of high-speed railway with speed per hour being above 400 kilometers
  • Preparation method of super-strong high-conductivity copper alloy serving as contact line material of high-speed railway with speed per hour being above 400 kilometers

Examples

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Effect test

Embodiment 1

[0032] Using pure copper, Cu-25%Nb master alloy, Cu-13%Cr master alloy, Cu-7%Zr master alloy and Cu-10%Ti master alloy as raw materials, it is melted in a vacuum induction melting furnace and quickly cast on water-cooled copper In the mold, the cooling rate is 30°C / s to obtain a Cu-3%Nb-1%Cr-0.5%Zr-0.2%Ti ingot. The ingot was drawn for multiple passes at room temperature, with a single drawing deformation of 0.15, and finally reached a drawing deformation of 5.5. The drawn and deformed copper alloy rod or wire was annealed at 375 °C for 100 h. The annealed copper alloy was drawn again at room temperature, and the drawing deformation was 0.5. The above copper alloy was frozen in liquid nitrogen for 72 h, and then slowly warmed to room temperature at a rate of 5 °C / min. The standard tensile test was used to test the tensile strength of the alloy, and the standard four-point method was used to test the room temperature conductivity of the alloy. The alloy was softened by anneal...

Embodiment 2

[0034] Using pure copper, Cu-10%Nb master alloy, Cu-5%Cr master alloy, Cu-5%Zr master alloy and Cu-3%Ti master alloy as raw materials, it is melted in a vacuum induction melting furnace and quickly cast on water-cooled copper In the mold, the cooling rate was 50°C / s to obtain a Cu-10%Nb-0.5%Cr-0.3%Zr-0.1%Ti ingot. The ingot was drawn for multiple passes at room temperature, with a single drawing deformation of 0.1 and a final drawing deformation of 6.0. Anneal the drawn and deformed copper alloy rod or wire at 450°C for 10 h. The annealed copper alloy was drawn again at room temperature, and the drawing deformation was 0.5. The above copper alloy was frozen in liquid nitrogen for 48 h, and then slowly warmed up to room temperature at a rate of 2 °C / min. The standard tensile test was used to test the tensile strength of the alloy, and the standard four-point method was used to test the room temperature conductivity of the alloy. The alloy was softened by annealing at 400 °C f...

Embodiment 3

[0036]Using pure copper, Cu-20%Nb master alloy, Cu-10%Cr master alloy, Cu-6%Zr master alloy and Cu-5%Ti master alloy as raw materials, it is melted in a vacuum induction melting furnace and quickly cast on water-cooled copper In the mold, the cooling rate was 100°C / s to obtain a Cu-20%Nb-0.1%Cr-0.1%Zr-0.05%Ti ingot. The ingot was drawn for multiple passes at room temperature, with a single drawing deformation of 0.2, and finally reached 4 drawing deformations. Anneal the drawn and deformed copper alloy rod or wire at 575°C for 1 h. The annealed copper alloy was drawn again at room temperature, and the drawing deformation was 0.5. The above copper alloy was frozen in liquid nitrogen for 12 h, and then slowly warmed to room temperature at a rate of 8 °C / min. The standard tensile test was used to test the tensile strength of the alloy, and the standard four-point method was used to test the room temperature conductivity of the alloy. The alloy was softened by annealing at 400 °...

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Abstract

Provided is a preparation method of a super-strong high-conductivity copper alloy serving as a contact line material of a high-speed railway with the speed per hour being above 400 kilometers. The copper alloy comprises, by weight, 3-20% of niobium, 0.01-1% of chromium, 0.01-0.5% of zirconium, 0.01-0.2% of titanium, and the balance copper. The preparation method comprises the steps that (1) simple substances and/or an intermediate alloy serve/serves as raw materials, the materials are fed according to the needed matching ratio, the materials are fused in a vacuum induction melting furnace and rapidly casted into a water-cooling copper mould, and the cooling speed is greater than 20 DEG C/s; (2) an ingot casting obtained in the step (1) is subjected to multi-pass drawing at a room temperature, deformation of a single pass of drawing is smaller than 0.3, and finally deformation of drawing above 3.5 is achieved; (3) a copper alloy bar or wire molded through drawing is annealed at 375-575 DEG C for 1-100 hours; (4) the annealed copper alloy is subjected to drawing at the room temperature again, deformation of a single pass of drawing ranges from 0.1 to 0.2, and deformation of drawing is 0.5-1.0; and (5) the copper alloy is put into liquid nitrogen to be subjected to freezing treatment for 12-72 hours, then the temperature is slowly increased to the room temperature, the temperature increasing rate is smaller than 10 DEG C/min, and the copper alloy is obtained.

Description

technical field [0001] The invention relates to a method for preparing a Cu alloy, in particular to a method for preparing a copper alloy that can be used as a contact wire material for a high-speed railway, especially a high-speed railway with a speed of more than 400 kilometers per hour. Background technique [0002] Since 2009, my country's high-speed electrified railway (hereinafter referred to as high-speed rail) has achieved substantial leap-forward development. The Beijing-Tianjin Line, Beijing-Shanghai Line and Beijing-Guangzhou Line have been opened one after another, and the high-speed rail has a stable operating speed of 300 km / h. The development of high-speed electrified railways has created huge market demands and demanding performance requirements for its key components - contact wires. The materials used as contact wires are required to have the following characteristics at the same time: high strength, low linear density, good electrical conductivity, good ab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/00C22C1/02C22C1/03C22F1/08
CPCC22C1/02C22C1/03C22C9/00C22F1/08
Inventor 刘嘉斌梅乐孟宪旗赵红彬
Owner ZHEJIANG UNIV
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