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A kind of preparation method of copper alloy for contact wire

A technology for contacting wires and copper alloys, applied in the field of copper alloy processing, can solve the problems of difficult preparation of carbon-carbon composite linings, inability to lubricate well, poor use effect, etc., and achieves low price, increased weight, The effect of improving the service life

Active Publication Date: 2021-05-28
CHINALCO MATERIALS APPL RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation of carbon-carbon composite lining is difficult and the cost is too high. BN or Al 2 o 3 The coating is difficult to prepare and cannot lubricate well, and the use effect is not good, so it is difficult to apply to industrial production

Method used

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  • A kind of preparation method of copper alloy for contact wire
  • A kind of preparation method of copper alloy for contact wire
  • A kind of preparation method of copper alloy for contact wire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Melting: Put the cathode copper into the three-furnace induction melting furnace with an intermediate transition chamber, add charcoal and graphite flakes to cover, and melt under the protection of argon;

[0036] (2) Degassing: feed argon into the copper melt in (1) for 20 minutes, and the oxygen content in the melt is measured to be 48ppm, and the treated melt is covered with charcoal and flake graphite, and filled with argon Protect;

[0037] (3) Alloying: Add Cu-15wt%Cr master alloy to the melt and melt it. After the Cu-15wt%Cr master alloy is completely melted, add Cu-20wt%Mg-10wt%Zr, Cu-5wt%B and Cu-15wt% Ti master alloy, stirring, standing still, adjusting the alloy composition to: Cr 0.2wt%, Zr 0.18wt%, Mg 0.2wt%, B 0.06wt%, Ti 0.2wt%, the balance is Cu;

[0038](4) Upward continuous casting: When the melt temperature reaches 1200°C, start drawing casting. The inner lining of the crystallizer is made of φ20mm SiC / graphite composite material (SiC60wt%, graph...

Embodiment 2

[0042] (1) Melting: Put the cathode copper into the three-furnace induction melting furnace with an intermediate transition chamber, add charcoal and graphite flakes to cover, and melt under the protection of argon;

[0043] (2) degassing: feed argon into the copper melt in (1) for 20 minutes, then add Cu-P and stir, leave standstill, record the oxygen content in the melt to be 23ppm, to the melt after processing Covered with charcoal, flake graphite, and filled with argon for protection;

[0044] (3) Alloying: Add Cu-15wt%Cr master alloy to the melt and melt it. After the Cu-15wt%Cr master alloy is completely melted, add Cu-15wt%Mg-10wt%Zr, Cu-5wt%B and Cu-15wt% Ti master alloy, stirring, standing still, adjusting the alloy composition to: Cr 0.52wt%, Zr 0.02wt%, Mg 0.1wt%, B 0.03wt%, Ti0.05wt%, the balance is Cu;

[0045] (4) Upward continuous casting: When the melt temperature reaches 1250°C, start drawing casting. The mold lining is made of φ20mm SiC / graphite composite ma...

Embodiment 3

[0049] (1) Melting: Put the cathode copper into the three-furnace induction melting furnace with an intermediate transition chamber, add charcoal and graphite flakes to cover, and melt under the protection of nitrogen;

[0050] (2) degassing: in copper melt in (1), pass into nitrogen for 20 minutes, record the oxygen content in the melt to be 35ppm, cover charcoal, flake graphite to the melt after handling, and fill nitrogen protection;

[0051] (3) Alloying: Add Cu-15wt%Cr master alloy into the melt to melt, after the Cu-15wt%Cr master alloy is completely melted, add Cu-10wt%Mg-10wt%Zr, Cu-5wt%B and Cu-15wt% Ti master alloy, stirring, standing still, adjusting the alloy composition to: Cr 0.45wt%, Zr 0.11wt%, Mg 0.13wt%, B 0.04wt%, Ti0.03wt%, the balance is Cu;

[0052] (4) Upward continuous casting: when the melt temperature reaches 1225°C, start drawing casting. The inner lining of the crystallizer is made of φ25mm SiC / graphite composite material (SiC70wt%, graphite 30wt%),...

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Abstract

A method for preparing a copper alloy for contact wires, comprising: (1) melting: adding cathode copper into a smelting furnace, adding a covering agent, and melting under a protective atmosphere; (2) degassing the melt: melting the obtained copper Degassing the melt, so that the oxygen content in the melt is 50ppm and below, and the treated melt is tightly covered and inert gas protection; (3) Alloying: adding Cu-Mg-Zr and other intermediate alloys to the copper melt (4) upward continuous casting: adopt SiC / graphite composite lining continuous casting crystallizer, carry out upward continuous casting to the gained copper alloy melt, obtain copper alloy ingot; (5) Processing: The resulting copper alloy ingot is processed into contact wires. 150mm obtained by the present invention 2 Cu‑Cr‑Zr contact wire, coil weight 2.5 tons, performance up to tensile strength 560MPa‑650MPa, elongation 5%‑12%, electrical conductivity 75‑85% IACS.

Description

technical field [0001] The invention relates to the technical field of copper alloy processing, in particular to a method for preparing a copper alloy for contact wires. Background technique [0002] With the advancement of technology, it is an inevitable trend for the future development of high-speed railways to further increase the speed to more than 400km / h, and it is necessary to use high-strength and high-conductivity Cu-Cr-Zr contact wires. Since a single contact wire requires at least 1200m in length, the nominal 150mm 2 According to the calculation of the copper alloy contact wire, the weight of a single coil of the wire blank that needs to be prepared reaches 2.5 tons, and the composition is required to be uniform throughout the entire length. Zr is a vulnerable element, and it is difficult to control the uniformity of the composition. The vacuum melting method can solve this problem, but it requires high equipment, increases the preparation cost, and has poor prod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/03C22C1/06C22C9/00B22D11/059B22D11/14C22F1/08
CPCB22D11/059B22D11/145C22C1/03C22C1/06C22C9/00C22F1/08
Inventor 向朝建娄花芬张曦管桂生陈忠平王金华杨春秀莫永达
Owner CHINALCO MATERIALS APPL RES INST CO LTD