Method for preparing high-purity low-oxygen chromium metal powder

A technology of metal chromium powder and metal chromium, which is applied in metal processing equipment, transportation and packaging, etc., can solve the problems of high cost and complex production process of chromium powder, achieve low cost, realize mass production, and reduce oxygen content. Effect

Active Publication Date: 2020-11-13
SIRUI ADVANCED COPPER ALLOY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the production process of chromium po

Method used

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  • Method for preparing high-purity low-oxygen chromium metal powder

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Embodiment 1

[0031] A preparation method of high-purity low-oxygen metal chromium powder, comprising the following steps:

[0032] Preparation of raw materials for S1 chromium powder: manual roughing of impurities in the aluminothermic metal chromium with a purity of 99.5%, picking out the inclusions and oxides visible to the naked eye on the chromium surface, reducing the impurity content in the newly prepared chromium powder, and the pretreated metal Chromium is powdered by low-temperature grinding and crushing method, and the low-temperature brittleness of chromium is used to grind and crush it to make powder;

[0033] S2 powder mixing: the chromium powder raw material with a particle size of 40 mesh is selected by screening, graphite powder is added thereto, and mixed material is obtained after fully mixing. The particle diameter of the graphite powder is less than 2000 mesh, and the purity of the graphite powder is 99.92%. Step S1 The sintering of chromium powder raw material and grap...

Embodiment 2

[0043] A preparation method of high-purity low-oxygen metal chromium powder, comprising the following steps:

[0044] S1 Chromium powder raw material preparation: Manually select the impurities in the thermite metal chromium with a purity of 99.35%, pick out the inclusions and oxides visible to the naked eye on the chromium surface, reduce the impurity content in the newly prepared chromium powder, and the pretreated metal Chromium is powdered by low-temperature grinding and crushing method to obtain raw material of chromium powder. Utilize the low-temperature brittleness of chromium to grind and pulverize it to make powder;

[0045] S2 mixed powder: sieve and select the chromium powder raw material with a particle size of 250 mesh, add graphite powder therein, and obtain the mixed material after fully mixing, the particle diameter of the graphite powder is less than 2000 mesh, and the purity of the graphite powder is 99.93%. The sintering of raw material and graphite powder ...

Embodiment 3

[0055] A preparation method of high-purity low-oxygen metal chromium powder, comprising the following steps:

[0056] Preparation of raw materials for S1 chromium powder: manual roughing of impurities in the thermite metal chromium with a purity of 99.4%, picking out inclusions and oxides visible to the naked eye on the chromium surface, reducing the impurity content in the newly prepared chromium powder, and the pretreated metal Chromium is powdered by low-temperature grinding and crushing method to obtain raw material of chromium powder. Utilize the low-temperature brittleness of chromium to grind and pulverize it to make powder;

[0057] S2 powder mixing: sieve and select the chromium powder raw material with a particle size of 500 mesh, add graphite powder to it, and mix thoroughly to obtain a mixed material. The particle diameter of the graphite powder is less than 2000 mesh, and the purity of the graphite powder is 99.95%. After raw material and graphite powder are mixe...

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Abstract

The invention discloses a method for preparing high-purity low-oxygen chromium metal powder, and belongs to the technical field of metal material processing. The method comprises the following steps that S1, chromium powder raw materials are prepared, wherein chromium metal is powdered through a low-temperature grinding and smashing method, and the chromium powder raw materials are obtained; S2, powder mixing is carried out, wherein after the chromium powder raw materials in the step S1 are screened, then graphite powder is added, and mixed materials are obtained; S3, pressing is carried out,wherein the mixed materials in the step S2 are pressed into a chromium blank through compression molding forming, then the chromium blank is placed in a low-temperature plasma device for deoxygenationpretreatment; S4, sintering is carried out, wherein the chromium blank obtained after deoxygenation pretreatment is carried out in the step S3 is placed in a vacuum sintering furnace to be sintered,degassed and deoxidized, and a chromium block is obtained; and S5, finished chromium powder is prepared, wherein the chromium block in the step S4 is powdered through the low-temperature grinding andsmashing method, and the high-purity low-oxygen chromium metal powder is obtained. In conclusion, the chromium metal powder prepared through the method has the advantages of being low in oxygen content, low in cost, capable of achieving volume production and the like.

Description

technical field [0001] The invention belongs to the technical field of metal material processing, and in particular relates to a preparation method of high-purity low-oxygen metal chromium powder. Background technique [0002] Chromium is an important alloying element. Due to its excellent properties such as hardness, brittleness and corrosion resistance, chromium is widely used in metallurgy, chemical industry, cast iron, refractory and high-end technology and other fields. [0003] Metal chromium powder is widely used in copper chromium contacts, vacuum sputtering coating targets, superalloy materials, 3D printing materials, high-performance welding materials and chromium-containing powder metallurgy products, etc. [0004] At present, the main production methods of metal chromium are aluminothermic reduction method and electrolysis method. [0005] The aluminothermic reduction method is to obtain chromium oxide from chromite, and then reduce the chromium oxide with an al...

Claims

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Application Information

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IPC IPC(8): B22F9/04B22F1/00B22F3/02B22F3/10
CPCB22F9/04B22F3/02B22F3/1007B22F2009/049B22F2009/045B22F1/145
Inventor 聂红锋闫利平孙刚刚王文斌梁建斌梁鹏帅宋新华冯亚红朱金泽翟荣荣
Owner SIRUI ADVANCED COPPER ALLOY CO LTD
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