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Rotating electrode preparing micro spherical metal powder and method of rotating electrode

A technology of rotating electrodes and metal powder, which is applied in the field of powder metallurgy industry, can solve the problems of low yield of fine spherical metal powder, and achieve the effects of improving maintenance characteristics, reducing average particle size, and improving atomization efficiency

Active Publication Date: 2017-05-17
SINO EURO MATERIALS TECH OF XIAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a rotating electrode for preparing fine spherical metal powder and a method thereof, adopt the preparation method of the present invention to obtain high yield of fine spherical metal powder, and solve the problem of general plasma rotating electrode method. The problem of low yield of preparing fine spherical metal powder

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  • Rotating electrode preparing micro spherical metal powder and method of rotating electrode

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Effect test

Embodiment 1

[0027] A rotating electrode rod with a diameter of 70mm and a length of 600mm was prepared from a nickel-based superalloy as a raw material. The Ar:He=1:4 mixed gas was used as the protective atmosphere and gas in the atomization chamber, and the gas circulation was added. The current of the plasma gun was 1000A. After the arc, the rotating electrode rod is driven to rotate at a speed of 15000rpm. The Laval nozzle of the plasma gun is 40mm away from the end face of the rotating electrode rod. The air inlet pressure at the front of the atomization chamber is 0.15MPa, and the yield of powder <75μm in the collected finished powder is 18wt.%. According to step 2, increase the power of the plasma gun to 1.4 times by increasing the current, increase the air pressure in front of the spray chamber to 0.3MPa, and at the same time control the gun head push rod to adjust the position of the plasma gun head in the Laval nozzle to high temperature and high pressure The air flow is stable an...

Embodiment 2

[0029] Using TC4 as raw material to prepare electrode rods with a diameter of 75mm and a length of 500mm, use Ar:He=1:4 mixed gas as the protective atmosphere to fill the atomization chamber, and add gas circuit circulation. The rotating electrode is rotated to make powder, the Laval nozzle of the plasma gun is 30mm away from the end face of the bar, the air inlet pressure at the front of the atomization chamber is 0.18MPa, and the yield of <53μm powder in the collected finished powder is 4.5wt.%. According to step 2, by increasing The high current increases the power of the plasma gun to 1.5 times, increases the air pressure before the atomization chamber to 0.3MPa, and at the same time controls the gun head push rod to adjust the position of the plasma gun head in the Laval nozzle to stabilize the high temperature and high pressure airflow and collect the finished product The yield of <53μm powder in the powder is 9.7wt.%, which is increased by 2.16 times.

Embodiment 3

[0031] A rotating electrode rod with a diameter of 79 mm and a length of 690 mm was prepared using pure nickel as a raw material. The Ar:He=1:8 mixed gas was used as the protective atmosphere and the gas in the atomization chamber, and the gas circulation was added. The current of the plasma gun was 1050A. The rotation speed of 13000rpm drives the rotating electrode rod to rotate, the Laval nozzle of the plasma gun is 35mm away from the end face of the rotating electrode rod, the air inlet pressure at the front of the atomization chamber is 0.2MPa, and the yield of <75μm powder in the collected finished powder is 11wt.%; according to step 2 , increase the power of the plasma gun to 1.4 times by increasing the current, increase the air pressure in the atomization chamber to 0.3MPa, and control the gun head push rod to adjust the position of the plasma gun head in the Laval nozzle to a stable injection of high temperature and high pressure airflow , the yield of <75μm powder in t...

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Abstract

The invention discloses a rotating electrode preparing micro spherical metal powder and a method of the rotating electrode. A plasma gun is composed of a Laval spraying pipe and a plasma gun head capable of conducting axial feeding, and a plasma gun inner gas way is formed between the plasma gun head and the Laval spraying pipe. The plasma gun head is connected with a gun head push rod, and a rotating electrode bar is connected with an electrode bar push rod. The axial relative position of the rotating electrode bar and the axial relative position of the plasma gun head are controlled and adjusted through the electrode bar push rod and the gun head push rod. A cylinder electrode bar is used as the raw material, and a plasma rotation electrode process is used for conducting the first time of atomization; supersonic speed high-temperature inert gas exerted to an electrode bar melting pool and injected by the adjustable plasma gun head is used for conducting the second time of atomization; centrifugal force of a centrifugal atomization mechanism overcomes tension on the surface of alloy liquid to serve as the upper limit of the atomization collected powder granularity; the efficiency of converting atomization energy into atomization drop surface energy is greatly improved; and the yield of micro powder smaller than 50 microns is greatly increased compared with traditional centrifugal atomization.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy industry, and in particular relates to a rotating electrode for preparing fine spherical metal powder and a method thereof. Background technique [0002] Due to its small specific surface area, spherical metal powder has less surface pollution, low impurities, high quality, and excellent fluidity, which meets the needs of high-quality metal injection molding and various additive manufacturing rapid prototyping technologies. The mainstream techniques for preparing spherical metal powders can be classified into gas atomization and rotating electrode. The main atomization mechanism of the gas atomization method depends on the gas flow rate. The range of powder particle size is wide, and the yield of fine powder <50μm is high. However, there are many defects such as hollow powder and satellite powder, which seriously affect the downstream key molding parts. performance; the atomization m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/10
CPCB22F9/10
Inventor 刘洋韩志宇王庆相梁书锦张平祥
Owner SINO EURO MATERIALS TECH OF XIAN CO LTD
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