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Method and device for preparing spherical metal powder through hot wire assisted plasma arc

A metal powder, plasma spray gun technology, applied to the preparation of spherical metal powder by ion hot wire spraying, powder metallurgy technology and surface engineering fields, can solve problems such as poor sphericity, high airflow velocity, arc extinguishing, etc. Efficiency, large operating process window, and simple device structure

Pending Publication Date: 2020-03-27
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention discloses a method and device for preparing spherical metal powder, which solves the problem of insufficient heating of filaments that often occurs when traditional non-transferred plasma arcs are used However, the problems of poor melting and poor sphericity of the atomized particles have also been improved, and the problem that the arc is easily extinguished due to the high air velocity in the original transferred arc method has been improved.

Method used

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  • Method and device for preparing spherical metal powder through hot wire assisted plasma arc
  • Method and device for preparing spherical metal powder through hot wire assisted plasma arc
  • Method and device for preparing spherical metal powder through hot wire assisted plasma arc

Examples

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Effect test

example 1

[0034] A plate of iron-based wire (17Cr-13Ni) with a diameter of 1.2 mm is selected as the raw material wire, and an anode nozzle with a diameter of 6.5 mm. Place the wire material on the wire feeder in the wire feeding sealed chamber, so that the wire material passes through the flexible wire feeding pipe and the ceramic wire guide nozzle to reach the center of the front end of the nozzle. The vertical distance from the wire material to the nozzle is 2 mm, and the feeding speed is set to Set at 50mm / s. Turn on the vacuum pump to vacuumize the whole set of equipment. When the pressure reaches -0.1Mpa, turn off the vacuum pump; put argon into the device to make the internal pressure reach 0.1Mpa, then turn on the vacuum pump again to draw vacuum, repeat the above operation three times until the entire pipeline It is an argon atmosphere; use the plasma arc as the heat source, adjust the parameters as current 400A, hydrogen 5L / min, argon 100L / min, after the arc is stable, adjust ...

example 2

[0036]Select a plate of iron-based wire (17Cr-10Ni) with a diameter of 1.4mm as the raw material, select a plasma anode nozzle with an outlet diameter of 7mm, and place the wire on the wire feeder in the wire feeding sealed chamber, so that the wire is sequentially Go through the wire feeding pipe and wire guide tube to the center of the nozzle, make the vertical distance from the metal wire to the nozzle 4mm, set the feeding speed to 70mm / s, turn on the vacuum pump to vacuumize the whole set of equipment, when the pressure reaches Turn off the vacuum pump at -0.1Mpa; put argon gas into the device to make the internal pressure reach 0.1Mpa, and then turn on the vacuum pump again to draw a vacuum, repeat the above operation three times until the whole pipeline is argon atmosphere; use the plasma arc as the heat source, adjust the parameters The current is 450A, the hydrogen gas is 6L / min, and the argon gas is 80L / min. After the arc is stable, adjust the wire feeding speed to 80m...

example 3

[0038] Select a plate of iron-based wire (15Cr-9Ni) with a diameter of 1.6 mm as the raw material wire, select a plasma anode nozzle with an outlet diameter of 7.5 mm, and place the wire on the wire feeder in the wire feeding sealed chamber to make the wire Go through the wire feeding pipe and wire guide tube to the center of the nozzle in turn, make the vertical distance from the metal wire to the nozzle 5mm, set the feeding speed to 75mm / s, turn on the vacuum pump to vacuumize the whole set of equipment, when the pressure Turn off the vacuum pump when it reaches -0.1Mpa; put argon gas into the device to make the internal pressure reach 0.1Mpa, then turn on the vacuum pump again to draw a vacuum, repeat the above operation three times until the whole pipeline is argon atmosphere; use the plasma arc as the heat source, adjust The parameters are current 500A, hydrogen 6.5L / min, argon 80L / min. After the arc is stable, adjust the wire feeding speed to 95mm / s, then turn on the auxi...

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Abstract

The invention discloses a method and device for preparing spherical metal powder. According to the method, a direct-current plasma arc is used for heating and melting and atomizing a metal wire, an auxiliary power source is directly applied to the metal wire, a main power source and the auxiliary power source are insulated, the auxiliary power source carries out resistance heating on the wire, andheating power needed by wire melting and atomizing can be greatly reduced. The invention further discloses the device using the method for preparing the spherical metal powder. The device comprises apowdering pipeline, a power source including the main power source and the auxiliary power source, a plasma spraying gun, an insulation mechanism, a wire feeding device, a powder flying pipeline, a powder collecting cylinder. A spraying gun cathode is connected with a negative electrode of the main power source, a through hole is formed in the front end of an anode, the insulation mechanism comprises an insulation gasket on the front end of an anode nozzle and an insulation ceramic wire guide nozzle on the front end of a wire feeding pipeline, the wire feeding device is arranged in a seal binand is provided with the wire feeding pipeline connected with a spraying gun, and the powder collecting cylinder is arranged on the tail of the powder flying pipeline.

Description

technical field [0001] The invention mainly relates to the fields of powder metallurgy technology and surface engineering, and in particular to the technical field of preparing spherical metal powder by a plasma hot wire spraying method. Background technique [0002] Spherical metal powders have broad application prospects in metallurgy, energy, electronics, medical, aerospace and other fields. The above fields have high requirements for the physical properties of the powder itself, such as high sphericity, narrow particle size distribution, low impurity content, purity higher. Plasma arc has the advantages of simple operation, high temperature, and easy adjustment of parameters. The prepared powder has high sphericity and low impurity content. Therefore, the use of plasma arc to atomize metal spherical powder has broad application prospects. At present, in the plasma arc atomization method, multi-electrode plasma arc, non-transferred arc, and transferred arc are the most i...

Claims

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Application Information

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IPC IPC(8): B22F9/08
CPCB22F9/082B22F2009/0824B22F2009/0848Y02P10/25
Inventor 李辉魏艺斌曲浩然林健符寒光
Owner BEIJING UNIV OF TECH
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