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Preparation method of consumable electrode bar for copper-chromium electric arc melting

An arc smelting and consumable electrode technology, applied in the field of metal processing, can solve the problems of increasing arc smelting product defects, reducing product quality consistency, low density of prefabricated electrode rods, etc. The effect of reducing the gas content

Active Publication Date: 2020-08-28
SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The disadvantages of these two processes for preparing arc melting prefabricated electrodes are that the process time and efficiency are low, and the prepared prefabricated electrode rods have a high gas content, usually the O content is between 600ppm-800ppm, plus the density of the prefabricated electrode rods Low: between 75%-85%, higher gas content and lower electrode rod density will disturb the arc stability during melting, increase the defects of arc melting products, and reduce the consistency of product quality

Method used

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  • Preparation method of consumable electrode bar for copper-chromium electric arc melting
  • Preparation method of consumable electrode bar for copper-chromium electric arc melting

Examples

Experimental program
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Effect test

Embodiment 1

[0034] A method for preparing a consumable electrode rod for copper-chromium arc smelting, comprising the following steps:

[0035] (1) Ingredients: by weight percentage, take 60% copper material and 40% chromium material for proportioning; copper material adopts electrolytic copper plate with a purity greater than 99.990%, and chromium material adopts chromium block with a purity greater than 99.9%, electrolytic copper plate and chromium The block is sanded to remove the surface oxide layer before smelting. The advantages of using electrolytic copper plate and chromium block are not easy to be oxidized and surface oxidized components are easy to remove compared with powdered raw materials.

[0036] (2) Ingot casting: the copper material and chromium material taken in proportion in step (1) are smelted and melted into liquid, and then poured into copper-chromium alloy ingot;

[0037] (3) Powder making: the copper-chromium alloy ingot is made into spherical copper-chromium all...

Embodiment 2

[0042] This embodiment is basically the same as that of Embodiment 1, except that, by weight percentage, 52% copper material and 48% chromium material are used for proportioning.

Embodiment 3

[0044] This embodiment is basically the same as that of Embodiment 1, the difference is that, by weight percentage, 90% copper material and 10% chromium material are used for proportioning.

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Abstract

The invention discloses a preparation method of a consumable electrode bar for copper-chromium electric arc melting, and belongs to the technical field of metal processing. The method comprises the steps of burdening, ingot casting, powder making, blank making, degassing and hot isostatic pressing, wherein in the blank making step, spherical copper-chromium alloy powder with the particle size of 5-15 micrometers is selected to be made into a copper-chromium alloy blank bar in a cold static pressure pressing or cold spraying deposition mode, the density of the consumable electrode bar is remarkably improved by combining a hot isostatic pressing process, the density is improved to about 99% from previous 75%-85%, the arc stability of the consumable electrode bar in the smelting process is improved favorably, the gas content of the consumable electrode bar is remarkably reduced from previous 600-800 ppm to 210-400 ppm, and the voltage fluctuation in the electrode bar smelting procedure isreduced.

Description

technical field [0001] The invention belongs to the technical field of metal processing, and in particular relates to a preparation method of a consumable electrode rod for copper-chromium arc melting. Background technique [0002] Vacuum copper-chromium series electrical contact materials are widely used in the field of medium-voltage series vacuum interrupters due to their excellent arc extinguishing, anti-welding resistance and arc ablation resistance. At present, the mainstream processes for preparing this contact material include: Vacuum infiltration, powder metallurgy, vacuum induction smelting and arc smelting processes, among which the copper chromium series contact materials prepared by the arc smelting process have the advantages of uniformly distributed microstructure, low gas content, and good product quality consistency, etc., but The cost of this process is high, the main factors are: the arc melting equipment is expensive and the process of preparing the prefa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/00C22C1/04C22C1/02C22F1/08C23C24/08B22F9/08B22F3/24B22F3/15B22F3/04C22B9/20
CPCB22F3/04B22F3/15B22F3/24B22F9/082B22F2003/248B22F2998/10C22B9/20C22C1/02C22C1/0425C22C9/00C22F1/002C22F1/08C23C24/087Y02P10/25
Inventor 李鹏王文斌刘凯张石松王小军杨斌李刚师晓云赵俊
Owner SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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