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Preparation method of high-strength and high-conductivity copper alloy serving as contact line material of high-speed rail with speed per hour of above 400 km

A technology of copper alloy and alloy, which is applied in the field of preparation of Cu alloy, can solve the problems such as the inability to meet the minimum requirements of contact wire material properties, and achieve the effects of preventing spheroidization, reducing solid solubility, and high resistance to softening temperature

Active Publication Date: 2016-09-07
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • 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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  • Preparation method of high-strength and high-conductivity copper alloy serving as contact line material of high-speed rail with speed per hour of above 400 km
  • Preparation method of high-strength and high-conductivity copper alloy serving as contact line material of high-speed rail with speed per hour of above 400 km
  • Preparation method of high-strength and high-conductivity copper alloy serving as contact line material of high-speed rail with speed per hour of above 400 km

Examples

Experimental program
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Effect test

Embodiment 1

[0031]Using pure Cu, pure Ag, pure Cr, pure Zr and pure Si as raw materials, the vacuum melting furnace was used to heat up and melt and cast to obtain Cu-12%Ag-0.3%Cr-0.1%Zr-0.05%Si cast rods. Multi-pass drawing at room temperature makes the area shrinkage rate reach 80%. The obtained sample was annealed at 300 °C for 24 h, and then continued to be drawn at room temperature. At this stage, the area shrinkage rate was 50%. Finally, the sample was placed in liquid nitrogen for 24 h and then returned to room temperature at a rate of 10 °C / min to make the obtained alloy Contains a large number of fine Ag nanofibers and Cr, Zr, Si nanoparticles. The average diameter of nanofibers is 50 nm, the length is greater than 2000 nm, the distance between fibers is less than 1000 nm, and the interface between the fiber and the copper matrix is ​​a semi-coherent interface, and there is a misfit dislocation for every 9 (111) atomic planes of Cu on the interface . The average diameter of Cr,...

Embodiment 2

[0033] Using pure Cu, Cu-20%Nb master alloy, Cu-5%Cr master alloy, pure Zr and pure Si as raw materials, using a vacuum melting furnace to heat up and melt and cast to obtain Cu-12%Nb-1%Cr-0.2%Zr- 0.1% Si cast rod, multi-pass drawing of the cast rod at room temperature to make the area shrinkage rate reach 85%. Afterwards, the sample was annealed at 320 °C for 16 h, and the obtained sample was drawn again. At this stage, the area shrinkage rate was 30%. Finally, the sample was placed in liquid nitrogen for 100 h, and then the temperature was raised at 5 °C / min to return to room temperature. The resulting alloy contains a large number of fine Nb nanofibers and Cr, Zr, Si nanoparticles. The average diameter of the nanofibers is 100 nm, the length is greater than 1000 nm, and the distance between the fibers is less than 8000 nm, and the interface between the fiber and the copper matrix is ​​a semi-coherent interface, and a misfit dislocation appears every 13 (111) atomic planes o...

Embodiment 3

[0035] Using pure Cu, pure Ag, Cu-15%Ta master alloy, and Cu-3%Cr master alloy as raw materials, the vacuum melting furnace is used to heat up and melt and cast to obtain Cu-6%Ag-6%Ta-0.1%Cr cast rods. The cast rod is drawn for multiple times at room temperature to make the area shrinkage rate reach 85%. Afterwards, the sample was annealed at 400°C for 8 hours, and the obtained sample was drawn again. At this stage, the area shrinkage rate was 40%. Finally, the sample was placed in liquid nitrogen for 1 hour, and then the temperature was raised at 2°C / min to return to room temperature, so that the obtained alloy Contains a large number of fine Ag and Ta nanofibers and Cr nanoparticles. The average diameter of the nanofibers is 100 nm, the length is greater than 1000 nm, the distance between the fibers is less than 1000 nm, and the interface between the fiber and the copper matrix is ​​a semi-coherent interface, and there is a fault at every 9 Cu (111) atomic planes on the Cu / A...

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Abstract

The invention discloses a preparation method of a high-strength and high-conductivity copper alloy serving as a contact line material of a high-speed rail with speed per hour of above 400 km. Components of the alloy alloy accord with a form of CuXY, wherein X is at least one of Ag, Nb and Ta; and Y is at least one of Cr, Zr and Si. The method comprises the following steps: a simple substance and / or raw materials of an intermediate alloy are fed in a vacuum smelting furnace according to a designed alloy component ratio for heating, melting and casting in a mold to obtain an ingot; the ingot is drawn by multiple times at room temperature to deform as a bar or a line; the section shrinkage of a sample reaches above 80%; then, the bar or the line is annealed; the alloy is drawn again; in the phase, the section shrinkage of the sample is within 50%; then, the liquid nitrogen freeze treatment is performed for the obtained alloy, so that remained X or Y solid soluble atoms in a copper matrix are continuously separated out; and then, the copper alloy is obtained through slowly heating to reach the room temperature.

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 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. Beijing-Tianjin Line, Beijing-Shanghai Line and Beijing-Guangzhou Line have been opened successively, 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, go...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/08C22C9/00
CPCC22C9/00C22F1/08
Inventor 刘嘉斌梅乐孟宪旗赵红彬
Owner ZHEJIANG UNIV
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