Method for preparing spherical chromium powder by gas atomization

A gas atomization, chromium powder technology, applied in the field of powder metallurgy, can solve the problems of high cost, difficult to control gas content, inability to prepare fine powder, etc., achieve the effect of high density, improve grinding efficiency, and shorten production cycle

Pending Publication Date: 2019-07-16
SIRUI ADVANCED COPPER ALLOY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Irregular chromium powder particles of raw materials are sprayed into the plasma torch by carrying gas through the feeding gun, and are rapidly heated and melted to form highly spherical droplets, which are rapidly solidified in a very short period of time to form spherical chromium powde

Method used

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  • Method for preparing spherical chromium powder by gas atomization
  • Method for preparing spherical chromium powder by gas atomization
  • Method for preparing spherical chromium powder by gas atomization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] First remove the surface skin, oxide film and nitrogen film of the chromium block, and use a hydraulic coarse crusher to mechanically crush the chromium block at a water-cooled temperature of -50°C to break it into particles; vibrate the particles at -50°C Grind to make chromium powder, put the chromium powder into the rubber sleeve and vibrate, reverse pier and then press, the pressure is 150MPa, the pressure holding time is 5min, press into chromium rods, put the pressed chromium rods into Sintering is carried out in a vacuum sintering furnace, the maximum sintering temperature is controlled at 1000°C, the holding time is 30 minutes, and the vacuum degree is <100pa. The sintered chromium rods are loaded into EIGA for powder making, and the heating power is 10Kw; the prepared spherical chromium powder has a particle size distribution of 35-45 μm.

Embodiment 2

[0024] First remove the surface skin, oxide film and nitrogen film of the chromium block, and use a hydraulic coarse crusher to mechanically crush the chromium block at water-cooled temperature to break it into particles; vibrate the particles at 10°C to make Chromium powder, put the chromium powder into the rubber sleeve and vibrate, reverse pier and then press, the pressure is 300MPa, the pressure holding time is 20min, press into chromium rods, put the pressed chromium rods into the vacuum sintering furnace For sintering, the maximum sintering temperature is controlled at 1200°C, the holding time is 480min, and the vacuum degree is <100pa. The sintered chromium rods are loaded into EIGA for powder making, and the heating power is 40Kw; the prepared spherical chromium powder has a particle size distribution of 15-25μm.

Embodiment 3

[0026] First remove the surface skin, oxide film and nitrogen film of the chromium block, and use a hydraulic coarse crusher to mechanically crush the chromium block at water-cooled temperature to break it into particles; vibrate the particles at -20°C to make To form chromium powder, put the chromium powder into the rubber sleeve and vibrate, reverse pier and then press, the pressure is 225MPa, the pressure holding time is 12.5min, press into chromium rods, put the pressed chromium rods into vacuum sintering Sintering is carried out in the furnace, the maximum sintering temperature is controlled at 1100°C, the holding time is 240min, and the vacuum degree is <100pa. The sintered chromium rods are loaded into EIGA for powder making, and the heating power is 25Kw; the prepared spherical chromium powder has a particle size distribution of 25- 35 μm.

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Abstract

The invention discloses a method for preparing spherical chromium powder by gas atomization, and belongs to the technical field of powder metallurgy. The method comprises the following specific stepsthat 1) preparing chromium powder; 2) pressing; 3) sintering; and 4) carrying out gas atomization EIGA. In the step 1), low-temperature grinding and crushing are carried out on a chromium block to prepare powder, the temperature is controlled between 50 DEG C-100 DEG C; in the step 2) after the chromium powder is put into a rubber sleeve for vibrating and reverse pier material, the chromium powderis pressed, wherein the pressure is 150 MPa-300 MPa, and the pressure maintaining time is 5 min-15 min; in the step 3), the pressed chromium rod is put into a vacuum sintering furnace for sintering,the sintering temperature is controlled to be 1000 DEG C-1200 DEG C, the heat preservation time is 30-480 min, and the vacuum degree is 100 pa; and in the step 4), the sintered chromium rod is injected into an EIGA (rotary electrode induction smelting vacuum air atomization) to prepare powder, wherein the heating power is 10-40 Kw. The spherical chromium powder prepared by the method is high in purity, low in gas content, good in sphericity and wide in particle size range distribution.

Description

technical field [0001] The invention relates to a method for preparing spherical chromium powder by gas atomization, and belongs to the technical field of powder metallurgy. Background technique [0002] In recent years, with the continuous development of 3D printing technology, the field of powder metallurgy has attracted more and more attention. Metal chromium is often used in metallurgy, chemical industry, electroplating, pharmaceutical and other industries due to its good chemical stability, high temperature resistance and corrosion resistance. At present, the chromium powder produced by the conventional powder-making technology is generally irregular in shape, resulting in the disadvantages of poor fluidity of the chromium powder and low density of the powder product. In order to improve the fluidity of the powder, a spherical chromium powder was prepared. [0003] At present, there are radio frequency plasma methods for producing spherical chromium powder at home and...

Claims

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Application Information

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IPC IPC(8): B22F9/08B33Y70/00
CPCB22F9/082B22F2998/10B33Y70/00B22F2009/045B22F3/04B22F3/1007
Inventor 闫利平聂红锋梁建斌王文斌郭创立张石松
Owner SIRUI ADVANCED COPPER ALLOY CO LTD
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