Method for manufacturing electron beam welding copper-tungsten contact piece by utilizing tungsten powder

A technology of electron beam welding and tungsten powder, which is applied in the direction of circuits, electric switches, electrical components, etc., can solve the problems of non-standard shape of sintered blanks, reduce the efficiency of post-processing, and can not add too much chromium, so as to achieve regular welding blanks, The effect of increasing the furnace loading capacity and high utilization rate

Active Publication Date: 2021-03-19
SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional production process uses a vacuum furnace or an atmosphere protection furnace for sintering copper infiltration. After the heating element generates heat, it heats the workpiece through heat conduction and convection. The entire furnace is heated, which consumes high energy, and the production cycle is long. The shape of the sintered blank is not good. Specifications, large blank material allowance, low material utilization rate, and reduce post-processing efficiency at the same time
[0003] In addition, because copper-tungsten alloy products have requirements on hardness, metal chromium needs to be added in the production process to increase the hardness of the product to above 70HB. Tungsten alloy and copper-chromium alloy) have an influence on the strength of the bond, with the increase of the precipitated chromium content, the strength gradually decreases, so the chromium cannot be added too much, and the hardness improvement is limited

Method used

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  • Method for manufacturing electron beam welding copper-tungsten contact piece by utilizing tungsten powder
  • Method for manufacturing electron beam welding copper-tungsten contact piece by utilizing tungsten powder
  • Method for manufacturing electron beam welding copper-tungsten contact piece by utilizing tungsten powder

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Effect test

Embodiment 1

[0046] A method for manufacturing electron beam welding copper-tungsten contacts by using tungsten powder, comprising the following steps:

[0047] S1 powder mixing: take an appropriate amount of tungsten powder for pretreatment, add the pretreated tungsten powder to the binder for mixing, and obtain tungsten skeleton powder; the specific steps include:

[0048]S1-1 pretreatment: Take tungsten powder with a particle size of 8.5 μm and reduce it under the protection of a reducing atmosphere at 550°C for 1 hour to obtain tungsten powder with surface activity;

[0049] S1-2 Mixing: add the tungsten powder obtained in step S11 to the binder and fully stir and mix under vacuum conditions at a temperature of 66°C. The mixing time is 12 hours. The components of the binder are oil-based binder and paraffin-based binder. Mixture, the mass ratio of the two is 100:55, and the mass ratio of binder to tungsten powder is 3.5:100;

[0050] S2 Molding: The mixed tungsten skeleton powder is u...

Embodiment 2

[0061] This embodiment is basically the same as Embodiment 1, the difference is:

[0062] Step S2 Molding: The mixed tungsten skeleton powder is unidirectionally pressed on a 200-ton hydraulic oil press to obtain a density of 10.2g / cm 3 tungsten billet;

Embodiment 3

[0064] This embodiment is basically the same as Embodiment 1, the difference is:

[0065] Step S2 Molding: Unidirectionally press the mixed tungsten skeleton powder on a 200-ton hydraulic hydraulic press to obtain a density of 10.9g / cm 3 tungsten billet;

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Abstract

The invention discloses a method for manufacturing an electron beam welding copper-tungsten contact piece through tungsten powder, and the method comprises the steps: S1, powder mixing, S2, forming, S3, skeleton firing, S4, sintering, S5, match milling, and S6, electron beam welding. A traditional production mode is changed, a needed copper layer is sintered and welded only at the copper-tungstenalloy end, the size specification of the copper-tungsten alloy end is reduced, the charging quantity is increased, the base body and the copper-tungsten alloy are connected in an electron beam weldingmode, the appearance of a welded blank is regular, and the later machining efficiency is greatly improved. and the problem that the strength of a sintering bonding surface is affected by precipitation of chromium in the sintering process is solved, and the hardness, the conductivity and the like meet the use requirements.

Description

technical field [0001] The invention relates to the technical field of manufacturing copper-tungsten contact sheets, in particular to a method for manufacturing copper-tungsten contact sheets for electron beam welding by using tungsten powder. Background technique [0002] Copper-tungsten alloy material has high withstand voltage and arc ablation resistance, and is widely used in various types of switch arc contacts. It is currently the most widely used contact material in various types of switches. The traditional production process uses a vacuum furnace or an atmosphere protection furnace for sintering copper infiltration. After the heating element generates heat, it heats the workpiece through heat conduction and convection. The entire furnace is heated, which consumes high energy, and the production cycle is long. The shape of the sintered blank is not good. Specifications, large margin of blank material, low material utilization rate, and reduce post-processing efficien...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H11/04H01H11/06
CPCH01H11/04H01H11/048H01H11/06
Inventor 康迪周兴周宁邵红颜刘萍王小军
Owner SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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