Plasma preparation method of spherical titanium powder for 3D printing

Abstract

The invention discloses a plasma preparation method of spherical titanium powder for 3D printing. Titanium powder in an irregular shape is selected as the raw material; argon carries titanium powder particles to be sprayed into a plasma torch through a feeding gun; the titanium powder particles are rapidly heated and fused, and the fused particles form liquid drops with a high degree of sphericity under the action of surface tension; and crushing gas is introduced to crush the fused liquid drops again, the fused liquid drops are rapidly cooled and solidified to form spherical titanium powder particles under the two different progressively increasing temperature gradients, powder is separated from plasma gas due to the efficient filtering gas, and the spherical powder is collected through a powder collection device. The titanium powder prepared by the method is controllable in component, particle size and degree of sphericity; the prepared spherical titanium powder is high in degree of sphericity, good in mobility, uniform in size distribution, little in impurity, high in compactness, high in quality and used for 3D printing; the preparation process is rapid and easy, and one-time molding is achieved.

Description

technical field [0001] The invention relates to the technical field of metal powder preparation, in particular to a plasma preparation method for spherical titanium powder for 3D printing. Background technique [0002] Titanium is a high-strength, corrosion-resistant, light-weight strategic metal material with abundant reserves. It is a necessary material for aircraft manufacturing and aerospace industries, and is also a key material for the applicability of 3D printing. Spherical titanium powder is widely used in powder metallurgy, thermal spraying, laser forming and other fields, and the preparation process of spherical titanium powder has become a hot spot of research and development at home and abroad. [0003] Metal 3D printing technology is the most cutting-edge and most potential technology in the entire 3D printing system, and it is an important development direction of advanced manufacturing technology. Metal powder is the most widely used in the field of 3D printi...

AI Technical Summary

Problems solved by technology

[0004] The material bottleneck has become the primary problem restricting the development of 3D printing; there is no mature technology in China to prepare high-performance spherical titanium powder for 3D printing, and most of the spherical titanium powder produced are primary, medium and low-grade products; the main technical bottleneck of spherical titanium powder preparation is The optimal preparation process parameters of materials and the control of spherical powder spheroidization rate, impurities and defects, and the high cost of preparation of pure titanium powder particles whose particle size, sphericity and fluidity meet the requirements of 3D printing make its application greatly restricted. restrict

At present, the common and widely used preparation methods for preparing spherical titanium powder have their own advantages and disadvantages: ① The titanium powder prepared by the inert gas atomization method has better sphericity and easier control of composition, but the particle size distribution range is wider and the particle size uniformity Insufficient, the difference in particle size is large, there are many internal defects, and a large amount of inert gas is consumed, so the production cost is high; The transformation depends on the rotational speed of the plasma rotating electrode equipment, so the requirements for the equipment are relatively high