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Method for preparing copper alloy for contact wire

A technology of contacting wires and copper alloys, which is applied in the field of copper alloy processing, can solve the problems of difficult preparation of carbon-carbon composite linings, poor lubrication, poor use effects, etc., to achieve low prices and improve service life , the effect of convenient preparation

Active Publication Date: 2020-07-31
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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  • Method for preparing copper alloy for contact wire
  • Method for preparing copper alloy for contact wire
  • Method for preparing 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 up-lead induction melting furnace with the intermediate transition chamber, add charcoal and graphite flakes to cover, and melt under the protection of argon;

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

[0037] (3) Alloying: Add Cu-15wt%Cr master alloy into the melt to melt, and after Cu-15wt%Cr master alloy is completely melted, add Cu-20wt%Mg-10wt%Zr, Cu-5wt%B and Cu-15wt% Ti master alloy, stir, stand still, adjust 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, draw casting is started. The lining of the mold is made of φ20mm SiC / graphite composite material (SiC60wt%, graphite 40wt%), and the...

Embodiment 2

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

[0043] (2) Degassing: Pour argon into the copper melt in (1) for 20 minutes, then add Cu-P and stir, and let it stand. The oxygen content in the melt is measured to be 23 ppm. For the treated melt Cover charcoal, flake graphite, and fill with argon for protection;

[0044] (3) Alloying: Add Cu-15wt%Cr master alloy into the melt to melt, and after Cu-15wt%Cr master alloy is completely melted, add Cu-15wt%Mg-10wt%Zr, Cu-5wt%B and Cu-15wt% Ti master alloy, stir, stand still, adjust 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, draw casting is started. The mold lining is made of φ20mm SiC / graphite composite material (SiC65wt%, graphite 35...

Embodiment 3

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

[0050] (2) Degassing: Pour nitrogen into the copper melt in (1) for 20 minutes, and the oxygen content in the melt is measured to be 35 ppm. Cover the treated melt with charcoal and flake graphite, and fill it with nitrogen for protection;

[0051] (3) Alloying: Add Cu-15wt%Cr master alloy into the melt to melt, after Cu-15wt%Cr master alloy is completely melted, add Cu-10wt%Mg-10wt%Zr, Cu-5wt%B and Cu-15wt% Ti master alloy, stir, stand still, adjust 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, draw casting is started. The mold lining is made of φ25mm SiC / graphite composite material (SiC 70wt%, graphite 30wt%), and the inner surface...

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Abstract

A method for preparing a copper alloy for a contact wire comprises the steps of (1) melting, wherein cathode copper is added into a smelting furnace, a covering agent is added, and melting is carriedout in a protective atmosphere; (2) melt degassing, wherein the obtained copper melt is degassed, so that the oxygen content in the melt is 50 ppm or below, and the treated melt is strictly covered and subjected to inert gas shielding; (3) alloying, wherein Cu-Mg-Zr and other intermediate alloys are added into the copper melt, and copper alloy melt is obtained; (4) up-drawing continuous casting, aSiC / graphite composite liner continuous casting crystallizer is adopted for carrying out up-drawing continuous casting on the obtained copper alloy melt, and a copper alloy ingot casting is obtained;and (5) machining, wherein the obtained copper alloy ingot casting is machined into the contact wire. According to the method, the roll weight of the obtained Cu-Cr-Zr contact wire of 150 mm<2> is 2.5 tons, the performance can reach the tensile strength of 560 MPa to 650 MPa, the ductility ranges from 5% to 12%, and the conductivity is 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 of future development for high-speed railways to further speed up to 400km / h and requires the use of high-strength and high-conductivity Cu-Cr-Zr contact wires. Since a single contact wire is required to be at least 1200m long, the nominal length is 150mm 2 According to the calculation of the copper alloy contact wire, the single coil of the wire blank to be prepared has a weight of 2.5 tons and requires a uniform composition over the entire length. Zr is a fragile element, and the uniformity of the composition is difficult to control. The vacuum smelting method can better solve this problem, but it requires higher equipment, increases the preparation cost, and has poor production continuity, which is not suitable for indu...

Claims

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Application Information

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Patent Type & Authority Applications(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
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