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Preparation method of high-strength and high-conductivity anti-friction copper contact wire

A contact line, high-conductivity technology, applied in conductors, conductive materials, conductive materials, etc., can solve problems such as insufficient wear resistance, and achieve the effect of short process, simple process and high efficiency

Active Publication Date: 2019-10-15
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, chromium-zirconium copper and dispersion-strengthened copper materials have insufficient wear resistance during use. The development of new copper-based materials with high strength, high conductivity, and excellent friction and wear properties is of great significance to the development of rail transit networks.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: Cu-0.1wt%MnS contact wire

[0019] Weigh the electrolytic copper plate and electrolytic manganese in proportion, prepare Cu-0.1wt% Mn alloy powder by water atomization process after non-vacuum smelting, and place the atomized Cu-0.1wt% Mn alloy powder in a hydrogen sulfide atmosphere. For vulcanization treatment, the vulcanization temperature is 300° C., the time is 20 minutes, and the gas flow rate is 5 l / min. After the vulcanization is completed, the powder is placed in a silica gel sheath for cold isostatic pressing, the pressing pressure is 50 MPa, and the holding time is 10 minutes to obtain a green body. The green body is sintered in an atmosphere of decomposed ammonia, the sintering temperature is 750°C, the temperature is kept for 10 hours, hot extrusion is carried out on-line, and the contact wire of the required specification is obtained by drawing. Its tensile strength at room temperature is 465 MPa, electrical conductivity is 93% IACS, and coeffi...

Embodiment 2

[0020] Example 2: Cu-1wt%MnS contact wire

[0021] Weigh the electrolytic copper plate and electrolytic manganese in proportion, prepare Cu-1wt% Mn alloy powder by nitrogen atomization process after vacuum smelting, and place the atomized Cu-1wt% Mn alloy powder in thiourea for liquid phase vulcanization treatment , the vulcanization temperature is 180°C, and the time is 120min. After the vulcanization is completed, the powder is placed in a silica gel sheath for cold isostatic pressing, with a pressing pressure of 200 MPa and a holding time of 2 minutes to obtain a green body. The green body is in a vacuum environment (the degree of vacuum is 10 -1 Pa) for sintering, the sintering temperature is 1050° C., heat preservation for 0.5 h, hot extrusion is carried out on-line, and contact wires of required specifications are obtained by rolling. Its tensile strength at room temperature is 513 MPa, electrical conductivity is 84% ​​IACS, and friction coefficient is 0.16.

Embodiment 3

[0022] Example 3: Cu-5wt%MnS contact wire

[0023] The electrolytic copper plate and electrolytic manganese are weighed in proportion, after vacuum smelting, Cu-5wt% Mn alloy powder is prepared by argon atomization process, and the atomized Cu-5wt% Mn alloy powder is placed in sulfur for vulcanization treatment, vulcanization The temperature is 600°C and the time is 3h. After the vulcanization is completed, the powder is placed in a silica gel sheath for cold isostatic pressing, the pressing pressure is 400 MPa, and the holding time is 10s to obtain a green body. The green body is sintered in a hydrogen atmosphere, the sintering temperature is 850°C, the temperature is kept for 4 hours, hot extrusion is carried out on-line, and the contact wire of the required specification is obtained by rolling. Its tensile strength at room temperature is 630 MPa, electrical conductivity is 76% IACS, and friction coefficient is 0.11.

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Abstract

The invention discloses a preparation method of high-strength and high-conductivity anti-friction copper contact wire, and belongs to the technical field of powder metallurgy copper-based materials. According to the preparation method, copper-manganese alloy powder is used as a raw material, vulcanization treatment is performed in a medium containing a sulfur source, in-situ generation of manganese sulfide nano particles is achieved inside the copper-manganese alloy powder through high-temperature diffusion, and the manganese sulfide dispersion strengthened copper contact wire is obtained through cold isostatic pressing and sintering-hot pressing combining densification processes. The preparation method has the advantages that the preparation technology is simple, the process is short, theenergy consumption is low, the raw material is rich and easy to obtain, the cost is low, and large-scale production is easy to achieve; and the prepared contact wire has the room temperature tensilestrength greater than 450 MPa, the conductivity greater than 75% IACS and the friction coefficient less than 0.2.

Description

technical field [0001] The invention relates to a high-strength, high-conductivity anti-friction copper contact wire and a preparation method thereof, belonging to the technical field of powder metallurgy copper-based materials. [0002] technical background [0003] With the continuous increase of train running speed, higher and higher requirements are put forward for the performance of contact wire materials for catenary. The basic requirements of contact wire alloy materials for railway electrification catenary are: high electrical conductivity, high tensile strength, high softening temperature, good fatigue vibration resistance, good wear resistance and corrosion resistance, etc. . [0004] Among them, the wear performance of the contact wire is a key indicator to characterize the actual service life and safety evaluation of the contact wire, and research on the wear performance of the contact wire is being carried out in various countries. At present, the high-strength...

Claims

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Application Information

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IPC IPC(8): C22C9/05C22C32/00C22C1/10C22C1/04B22F1/00B22F3/04B22F3/10B22F3/20B22F9/08H01B1/02
CPCC22C9/05C22C32/0089C22C1/10B22F9/082B22F3/04B22F3/10B22F3/20H01B1/026B22F2003/208B22F2998/10B22F1/145
Inventor 陈存广李沛郭志猛杨芳王雯雯路新陆天行冯娜
Owner UNIV OF SCI & TECH BEIJING
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