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Preparation method of chromium powder for producing copper-chromium contact

A copper-chromium contact and chromium powder technology is applied in the processing field of metal materials, and can solve the problems of high production cost and oxygen content of chromium powder, irregular particle shape, uneven distribution of copper-chromium, etc., and achieve a controllable particle size distribution range. , stable quality, good anti-welding performance

Active Publication Date: 2008-12-31
ZHEJIANG YATONG METAL CERAMICS +1
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Problems solved by technology

At present, the chromium powder used in the production of copper-chromium contacts is produced by ordinary mechanical crushing method, the particle shape is irregular, the particle size distribution range is wide, and the content of oxygen and nitrogen is high, resulting in high oxygen and nitrogen in the copper-chromium contact material. and microcosmic uneven distribution of copper and chromium
Chromium powder produced by electrolysis is not used in the production of copper-chromium contacts due to the production cost and high oxygen content

Method used

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Effect test

Embodiment

[0021] The process flow of the present invention includes: raw material chromium block→coarse crushing→vortex fine crushing→vacuum ball milling→vibrating sieving→chrome powder;

[0022] 1. Weigh 20 kg of chromium block of the aforementioned composition (composition as described in 5.1).

[0023] 2. Put the above-mentioned 20kg chromium block into a water-cooled hydraulic primary crusher for primary crushing. After primary crushing, the maximum particle diameter is less than 3mm, and the actual weight is 19.95kg.

[0024] 3. Place the above-mentioned 19.95 kg of fine chromium particles with a diameter of less than 3 mm in a turbine pulverizer for fine crushing to obtain 19.75 kg of -100 mesh chromium powder.

[0025] 4. Put the above-mentioned 19.75kg-100 mesh chromium powder into a vacuum ball mill for ball milling, the ball-to-material ratio=2.5:1, control the speed of the ball mill so that the balls are in a rolling state, and the ball milling time is 96 hours.

[0026] 5. ...

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Abstract

The invention relates to a preparation method of chromium powder for manufacturing a copper-chromium contact. The preparation method mainly comprises the steps as follows: selection of raw chromium block, coarse crushing, vortex fine crushing, vacuum ball milling and vibrating sieving and obtaining the chromium powder; the coarse crushing is carried out by a special hydraulic coarse crusher with a water cooling plant in a room which is provided with an air conditioner and a dehumidifier, after the coarse crushing, the largest particle diameter is less than 3mm, the chromium can be effectively prevented from heating and oxidation in the course of the coarse crushing, the vortex fine crushing is carried out in a closed system which consists of an automatic feeder, a turbo-mill, a powder collector, a vacuum pump, an argon inlet and a cooler, after the vortex fine crushing, the chromium powder is put into a vacuum ball mill for ball milling with the ball-material ratio being 2:1-3:1, the rotary speed of the ball mill is controlled to ensure that the material ball is in a rolling state, and the ball milling time is 91-101 hours. The preparation method has the advantages that the quality of the chromium powder is stable, the production efficiency is high, the energy consumption is low, the powder yield is high, etc.

Description

technical field [0001] The invention relates to a method for manufacturing chromium powder specially used for copper-chromium contact materials of vacuum switches, and belongs to the technical field of metal material processing. Background technique [0002] Copper-chromium contacts have excellent electrical and thermal conductivity, low cut-off value, high withstand voltage level, good resistance to arc ablation and excellent resistance to welding, so they have been used in the manufacture of medium and high voltage vacuum switch tubes. Lots of use. The particle size, shape and oxygen and nitrogen content of chromium powder are the main factors affecting the performance of copper-chromium contacts. At present, the chromium powder used in the production of copper-chromium contacts is produced by ordinary mechanical crushing method, the particle shape is irregular, the particle size distribution range is wide, and the content of oxygen and nitrogen is relatively high, result...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04
Inventor 丁枢华方敏余祖良
Owner ZHEJIANG YATONG METAL CERAMICS
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