Metal powder preparation device and method through vacuum induction melting and double-flow gas atomization

Abstract

The invention discloses a metal powder preparation device and method through vacuum induction melting and double-flow gas atomization. According to the technical scheme, the device is characterized by comprising a smelting chamber, an atomization chamber arranged below the smelting chamber, an atomization chamber bottom shell and a gas introducing shell arranged on the base, wherein the smelting chamber is communicated with the atomization chamber, an induction coil, an atomization nozzle and a smelting crucible for smelting metal are arranged in the smelting chamber, the gas introducing shell comprises an outer casing and a gas curtain shell, a gas compression chamber is formed between the outer casing and the gas curtain shell, a high-pressure gas inlet pipeline is arranged on the outer casing, a plurality of gas curtain ports are formed in the gas curtain shell in a circumferential array manner, and the gas curtain ports are arranged in a long-strip shape; and a collecting tank and a gas recovery device are arranged at the lower end of the bottom shell and both connected with the shell. The metal powder preparation device through vacuum induction melting and double-flow gas atomization can be used for preparing the fine spherical metal powder, and the effects of reducing satellite powder and improving the preparation precision of the metal powder are achieved.

Description

technical field [0001] The invention relates to the technical field of preparation of spherical metal powder materials, in particular to a vacuum induction melting double-flow gas atomization metal powder device and method. Background technique [0002] Microscopic spherical metal powders are important raw materials for technologies such as additive manufacturing (3D printing), metal injection molding, hot isostatic pressing and coating. The gas atomization method is one of the main preparation methods of fine spherical metal powder. Its principle is to break the molten metal into tiny droplets through the impact of high-speed moving gas (atomization medium). Spheroidization occurs under the action of surface tension, and quickly condenses into spherical or near-spherical metal powder particles of different particle sizes, and is finally collected in the powder tank by the grading system. [0003] However, the current metal powder prepared by gas atomization has the phenome...

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Problems solved by technology

[0003] However, the current metal powder prepared by gas atomization has the phenomenon of "satellite powder" in which small particles adhere to large particles, which reduces the fluidity and bulk density of the powder.

Too much satellite powder will reduce the process performance of the powder and the quality of the final product. For example, powders with poor fluidity in 3D printing are more likely to link, causing "bridges", or powder clogging in the printing equipment, affecting the uniformity of the powder layer distributed

[0004] In contrast, powders with high fluidity can better form fine spherical metal powders when flowing, and it is also necessary to reduce the collision between powders when flowing, thereby reducing the formation of satellite powders, but currently there are In the gas atomization preparation device, the air flow is prone to eddy current when flowing, resulting in poor fluidity, and the collision between powders is easy to form, and then the phenomenon of satellite powder is formed, which affects the accuracy of material addition and coating

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