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Device and method for spheroidizing powder by utilizing high-energy high-speed plasma flame flow

A plasma and plasma torch technology, which is applied in the field of spherical powder preparation, can solve the problems of many satellites, hollow balls, and poor sphericity, and achieve the effects of fewer satellites, high solidity rate, and high powder-making efficiency

Inactive Publication Date: 2018-10-02
王海军
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Another object of the present invention is to overcome the defects of large particle size, many hollow spheres, many satellite spheres and poor sphericity in the preparation of spherical powder in the prior art, and to provide a high-energy and high-speed plasma flame flow that can efficiently obtain small particle size and spherical powder. , Spheroidized powder method with less hollow

Method used

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  • Device and method for spheroidizing powder by utilizing high-energy high-speed plasma flame flow
  • Device and method for spheroidizing powder by utilizing high-energy high-speed plasma flame flow
  • Device and method for spheroidizing powder by utilizing high-energy high-speed plasma flame flow

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] The plasma torch adopts high-energy supersonic plasma torch (supersonic plasma spray gun), and the powder raw material adopts the irregular shape titanium powder prepared by hydrogenation method, and adopts the method of internal powder feeding (nozzle) to feed the powder. The main gas of the inert working gas is argon, and the auxiliary gas is For helium, the specific working parameters are as follows:

[0083]Particle size of powder raw material: 38~58μm,

[0084] Argon flow: 6m 3 / h,

[0085] Helium flow: 2m 3 / h,

[0086] Current: 800A,

[0087] Working voltage: 125V,

[0088] The minimum negative pressure in the powder making kettle: 10mba,

[0089] The maximum positive pressure of the powder making kettle during work: 0.15MPa;

[0090] Control the feeding amount of powder raw material as:

[0091]

[0092] The titanium spherical powder obtained in Example 1 has a proportion of more than 50%; the spherical powder is basically solid, and there are few sat...

Embodiment 2

[0094] The plasma torch adopts high-energy supersonic plasma torch (spray gun), and the powder raw material adopts irregular shape titanium powder prepared by hydrogenation method, and adopts the method of external powder feeding (nozzle) to feed the powder, the main gas of the inert working gas is argon, and the auxiliary gas is helium , the specific working parameters are as follows:

[0095] Particle size of powder raw material: 38~58μm,

[0096] Argon flow: 5m 3 / h,

[0097] Helium flow: 2m 3 / h,

[0098] Current: 800A,

[0099] Working voltage: 120V,

[0100] The minimum negative pressure in the powder making kettle: 10mba,

[0101] The maximum positive pressure of the powder making kettle during work: 0.15MPa;

[0102] Control the feeding amount of powder raw material as:

[0103]

[0104] The titanium spherical powder obtained in Example 2 has a proportion of more than 40%; the spherical powder is basically solid, and there are few satellites; the milling eff...

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Abstract

The invention discloses a device for spheroidizing powder by utilizing high-energy high-speed plasma flame flow. The device comprises a powder preparation kettle, a supersonic plasma torch, a jet nozzle, a powder feeder and a powder holding basin; the front end of the supersonic plasma torch is inserted into the powder preparation kettle; the jet nozzle is mounted at the front end of the supersonic plasma torch; a gas inlet hole is formed in the axial direction of the jet nozzle, and powder feeding holes are formed in the radial direction of the jet nozzle; the powder feeding holes communicatewith the gas inlet hole; the powder feeder is provided with a powder feeding connector, and communicates with the powder feeding holes of the jet nozzle through the powder feeding connector; and thepowder holding basin is arranged at the bottom of the powder preparation kettle and is used for collecting spherical powder which is produced in the powder preparation kettle. The invention also provides a method for spheroidizing the powder by utilizing the device; and the proportion and flow of a working gas, current and the like in a preparation process are controlled so as to ensure stable continuous operation of a plasma flame flow powder spheroidizing system. According to the device and the method for spheroidizing powder by utilizing the plasma flame flow provided by the invention, theobtained metal powder has high purity, few hollow spheres, high sphericity degree and high efficiency, does not have satellite spheres, and does not stick to the jet nozzle in long-time continuous work.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of spherical powder, and in particular relates to a device and method for spheroidizing powder by utilizing high-energy and high-speed plasma flame flow. Background technique [0002] With the development of science and technology, the application of metal 3D printing technology is becoming more and more extensive. Some large-scale titanium alloy special-shaped structural parts such as aircraft keels can only be manufactured using 3D printing technology. High-purity and small particle size (15-53 μm) spherical titanium powder is the raw material for 3D printing, and the powder properties have an important impact on product quality. In addition, the performance of titanium powder is also a key factor in determining the quality of titanium and titanium alloy powder metallurgy products. The preparation of titanium coating by thermal spraying is an effective way to solve the anti-corrosio...

Claims

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Application Information

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IPC IPC(8): B22F9/14B22F1/00
CPCB22F9/14B22F1/065
Inventor 王海军
Owner 王海军
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