Device and method capable of preparing spherical powder through high-energy plasma flame flow

Abstract

The invention discloses a device capable of preparing spherical powder through high-energy plasma flame flow. The device comprises a powder preparing kettle, a plasma torch spray gun and a powder feeding device, wherein the plasma torch spray gun is inserted in the powder preparing kettle and is provided with an air spraying hole in the axial direction; the powder feeding device is connected withone end of a powder feeding pipe; and the other end of the powder feeding pipe is fed into the plasma torch spray gun in the axial direction of the plasma torch spray gun and is used for conveying rawmaterial powder into the plasma torch spray gun. The device can prepare metal spherical powder with smaller particle size, and the productive rate is higher. The invention further provides a method capable of preparing spherical powder through high-energy plasma flame flow. The spherical powder with the particle size being 15-53 microns can be prepared, is basically solid, high in stability and higher in productive rate. The proportion of the metal spherical powder with the particle size being 15-53 microns in the metal spherical powder can be controlled to obtain more excellent preparation parameters and improve the preparation efficiency.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy, and more specifically, the invention relates to a device and a method for preparing spherical powder by a high-energy 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 the key factor to determine 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-corrosion of marine equipment, ...

AI Technical Summary

Problems solved by technology

But the disadvantage is that the highest spheroidization rate of the powder is only 85%, and it needs to be sieved multiple times, the production efficiency is low, and the cost is high. In the process of preparing spherical titanium powder, due to factors such as melting collision and vaporization recrystallization, it will Causes the formation of a certain number of large particles, so the non-spherical powder particles to be spheroidized cannot be too large

[0011] In summary, the preparation of titanium powder by gas atomization method cannot solve the problem of hollow powder; the particle size of titanium powder prepared by plasma rotating electrode method is too large, and it is impossible to prepare titanium powder with a particle size of less than 53 μm, which is most suitable for 3D printing and thermal spraying; The efficiency of preparing titanium powder by radio frequency plasma spheroidization is low, the cost is high, and the price of powder is relatively high

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