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A kind of preparation method of superfine chromium powder

A chromium powder and powder technology, applied in the field of ultrafine chromium powder preparation, can solve the problems of low production efficiency, metal impurities, large particle size distribution segregation, high oxygen and nitrogen content of alloys, etc. The effect of uniform diameter and strong welding resistance

Active Publication Date: 2016-03-16
SIRUI ADVANCED COPPER ALLOY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (4) Ball milling method: This method is a relatively common method for producing ultrafine metal powder, which has low production efficiency and is easy to introduce metal impurities
At present, the chromium powder used in the production of materials such as spraying, high-temperature alloys, diamond tools, ferroalloys, solders, cermets, hard alloys, resistance heating alloys, and electrical contacts is produced by ordinary mechanical pulverization, and the particle shape is irregular. , the segregation degree of the particle size distribution is large, and the content of other components, especially oxygen and nitrogen, is high, which results in the high content of oxygen and nitrogen in the target material and the uneven distribution of alloy elements in the microcosm
Chromium powder produced by electrolysis is not widely used in production due to high oxygen content and high processing cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The preparation method of superfine chromium powder comprises the following steps:

[0030] 1) Select the metal chromium block, remove the surface skin, oxide film and nitrogen film; then use the hydraulic coarse crusher with circulating water cooling device to mechanically crush the chromium block to make it into particles below 3mm;

[0031] 2) Using the low-temperature brittleness of chromium, immerse the metal chromium particles in liquid nitrogen, and perform low-temperature vibration grinding at the same time. The low-temperature vibration grinding uses nano-Al 2 o 3 with ZrO 2 The vibrating mill cylinder liner and grinding body made of mixed high-toughness ceramic materials are carried out for 3 hours;

[0032] 3) Wash the metal chromium powder ground by low-temperature liquid nitrogen three times with ethanol, each dosage is 600ml, then use a vacuum system with Waterman 50# filter paper to filter, then in a vacuum oven, at 80 ° C, vacuum Drying at a low tempe...

Embodiment 2

[0037] The preparation method of superfine chromium powder comprises the following steps:

[0038] 1) Select the metal chromium block, remove the surface skin, oxide film and nitrogen film; then use the hydraulic coarse crusher with circulating water cooling device to mechanically crush the chromium block to make it broken into particles below 3mm;

[0039] 2) Using the low-temperature brittleness of chromium, immerse the metal chromium particles in liquid nitrogen, and perform low-temperature vibration grinding at the same time. The low-temperature vibration grinding uses nano-Al 2 o 3 with ZrO 2 The vibrating mill cylinder liner and grinding body made of mixed high-toughness ceramic materials are carried out for 5 hours;

[0040] 3) Wash the metal chromium powder ground by low-temperature liquid nitrogen three times with ethanol, each dosage is 500ml, then use a vacuum system with Waterman 50# filter paper to filter, then in a vacuum oven, at 80 ° C, vacuum Drying at a lo...

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Abstract

The invention discloses a preparation method for superfine chromium powder. The preparation method for the superfine chromium powder comprises the following steps of (1) selecting metal chromium metal blocks, removing edge skin, oxidation films and nitrogen films and performing mechanical disruption; (2) soaking chromium metal blocks into the liquid nitrogen according to the low temperature brittleness of chromium and meanwhile performing low temperature vibration milling for 2 hours; (3) performing low temperature 80-degree drying on the chromium metal powder after low temperature liquid nitrogen milling and screening; (4) arranging the minus 400-mesh chromium powder into a high energy ball mill to perform ball milling; (5) enabling the powder after ball milling to continuously and uniformly pass through a heating area and a cooling area of a hydrogen cooling plasma area in a free falling movement mode, achieving deoxygenation and sintering in the heating area and obtaining the sintering powder. The purity of chromium metal products produced from the preparation method is from 99 to 99.5 %, the oxygen content mass percentage is less than 0.35 %, the particle shapes are close to spherical shapes, the grain size is uniform and meanwhile the preparation method for the superfine chromium powder is simple in device, low in cost and convenient to expand and achieve industrialized production.

Description

technical field [0001] The invention relates to a preparation method of ultrafine chromium powder, which belongs to the technical field of metal material processing. Background technique [0002] Metal chromium is the hardest metal, and normal chromium is brittle because it contains hydrogen or traces of oxides. High-purity chromium is not brittle, but malleable. Due to the high hardness of chromium, significant problems have been encountered in the process of preparing ultra-fine-grained high-purity chromium powder, that is, it is difficult to meet the requirements of both purity and particle size, or the processing time is long and processing higher cost. The general methods of obtaining ultra-fine metal powder in industry are: [0003] (1) Hydrogen reduction method: This method is generally used to produce high-melting point metal powders, such as tungsten, molybdenum, etc., and can obtain μm-level powders. [0004] (2) Hydrogenation-disproportionation-dehydrogenation...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/04
Inventor 杨平郭创立聂志林陈梅
Owner SIRUI ADVANCED COPPER ALLOY CO LTD
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