Cascade type plasma generator

Abstract

The invention belongs to the plasma technology, and particularly relates to a cascade type plasma generator. The generator comprises a cathode assembly, a cathode seat, an anode, a cathode seat and an anode cascade plate. The cathode seat and the cascade plates are coaxially mounted, the cathode seat is fixedly connected with the cascade plates below the cathode seat through the screw rod, and the insulating sleeve is wrapped outside the connecting screw rod. Each part of the cascaded plasma generator is provided with a cooling channel, and the parts are independently water-cooled and do not interfere with each other, so the parts are convenient to independently disassemble, assemble and maintain; a cascade plate is adopted for transition between the cathode and the anode, when the equipment works, working gas is ionized between the cathode and the anode to form plasmas, electrons are emitted from a cathode head 23, accelerated by an electric field and then fall on the cascade plate, the cascade plate is adopted for transition, electrode material loss caused by electron bombardment can be solved, electrode ablation is effectively relieved, and the service life is prolonged.

Description

technical field [0001] The invention belongs to the plasma technology, in particular to a cascaded plasma generator used for spherical powder preparation. Background technique [0002] In recent years, the additive manufacturing technology led by 3D printing is one of the most concerned emerging technologies in the world, and it is becoming a new trend to change the traditional manufacturing method, especially in the preparation of special-shaped or complex structural parts. It improves the utilization rate of materials and reduces the preparation cycle of parts, but the fluidity of raw material powder is one of its basic requirements. Thermal plasma jet has the characteristics of high temperature, high enthalpy, high energy density, etc. It is considered to be one of the most effective ways to prepare spherical powder materials. In practical industrial applications, plasma generators are required to have high stability, high efficiency and long life. characteristics such a...

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Problems solved by technology

[0003] At present, the methods of using plasma technology to prepare spherical powder mainly include plasma rotating electrode method and high-frequency induction coupling spheroidization method, etc. The plasma rotating electrode method has defects such as low yield of fine powder.

Although the high-frequency induction coupling spheroidization method is an ideal method for preparing spherical powders, it has risks such as high-frequency plasma torches being easily damaged during the powder spheroidization process, resulting in a short service life and hindering industrial applications. process

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