Super-strong high-conductivity copper alloy used as material for contact lines of high speed railways with speed per hour being 400 km or above

A technology of copper alloy and intermediate alloy, which is applied in the direction of power rails, etc., can solve the problem of not being able to meet the minimum requirements for contact wire material performance, and achieve the effects of reducing the scattering effect of solid solution atoms, improving the strength of the alloy, and reducing scattering

Active Publication Date: 2016-11-09
ZHEJIANG UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

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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  • Super-strong high-conductivity copper alloy used as material for contact lines of high speed railways with speed per hour being 400 km or above
  • Super-strong high-conductivity copper alloy used as material for contact lines of high speed railways with speed per hour being 400 km or above

Examples

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Effect test

Embodiment 1

[0030] 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

[0032] 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

[0034]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

Disclosed is super-strong high-conductivity copper alloy used as a material for contact lines of high speed railways with the speed per hour being 400 km or above. 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 copper alloy is in a long bar or line form, wherein niobium in the form of nanofibers and solid solution atoms is distributed in a copper substrate, most of the niobium nanofibers are arranged in the copper substrate approximately in parallel, and the axial direction of the fibers is roughly parallel to the axial direction of the copper alloy bar or line. Chromium in the form of nano-particles and solid solution atoms is distributed around the niobium nanofibers and in the copper substrate, zirconium in the form of copper-zirconium compound nano-particles and solid solution atoms is distributed around the niobium nanofibers and in the copper substrate, and titanium in the form of a copper-titanium GP zone and solid solution atoms is distributed in the copper substrate. The total quantity of the niobium, chromium and zirconium solid solution atoms in the copper alloy is smaller than 0.2%. Part of the chromium nano-particles and the copper-zirconium compound nano-particles are pinned in the phase interface of the niobium nanofibers and the copper substrate.

Description

technical field [0001] The invention relates to a Cu alloy and its application as a contact wire material for high-speed railways, especially high-speed railways 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 abrasion resistance, good corrosion resistance, etc., especially strength and el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/00C22C1/03C22F1/08
CPCC22C1/03C22C9/00C22F1/08B60M1/30
Inventor 刘嘉斌徐雨晴王宏涛方攸同孟亮王立天田雨
Owner ZHEJIANG UNIV
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