Novel spherical powder and preparation method thereof

Abstract

The invention relates to novel spherical powder and a preparation method thereof. The method comprises the following steps that an electrode and a workpiece are arranged at two poles of a power supply; a discharge gap between the electrode and the workpiece is adjusted through a motion control system to generate arc plasma; the arc plasma acts on the electrode and the surface of the workpiece so that the electrode and the surface of the workpiece are fused to form a fusion area; a fluid medium is introduced into the discharge gap; the flow rate of the fluid medium is controlled; the relative rotating speed of the electrode or the workpiece is controlled; the work state of the arc plasma is changed, so that tiny explosion is generated in the fusion area; a material in the fusion area is thrown away and crushed, the crushed material is condensed in the fluid medium, and condensed fine spherical powder is collected; and the electrode or the workpiece is provided with a hollow cavity. Thespherical powder prepared through the method is small in particle size, regular in particle shape, high in sphericity degree and low in content of hollow powder and satellite powder.

Description

technical field [0001] The invention relates to the field of metal powder preparation, in particular to a novel spherical powder and a preparation method thereof. Background technique [0002] With the continuous development of industrial technology, new materials and molding technologies are constantly being introduced, and are widely used in national defense and civilian core equipment, and these equipment generally face complex and harsh working environments, which requires that new materials should have very high Strength and toughness, and very high resistance to creep, fatigue, oxidation and corrosion. Accompanied by high requirements on the performance of new materials, the preparation of such materials has also become very difficult. At present, most of the products and parts of this kind of materials are prepared by near net shape technology, such as: powder metallurgy, additive manufacturing (3D printing technology) and injection molding. Metal powder is one of t...

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Problems solved by technology

At present, the advantages of gas atomization powder used in additive manufacturing parts are that the process is mature and stable, the powder particle size is small, the structure is fine, and the element segregation is less, which is conducive to improving the mechanical properties of parts and reducing the cost of powder for selective laser melting process; but hollow Factors such as powder and satellite powder increase the risk of increased porosity and microcracks in parts; the advantage of using rotating electrode powder for additive manufacturing parts is that there are very few hollow powder and satellite balls, the parts are densely formed, and the surface roughness is small , which is beneficial to fracture and fatigue properties, but the cost of powder preparation is high, the particle size distribution is narrow, and the powder particle size is large, so it is difficult to use in 3D printing technology

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