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Spraying method of supersonic plasma

A plasma and plasma arc technology, applied in coating, fusion spraying, metal material coating process, etc., can solve problems such as inability to apply

Inactive Publication Date: 2005-01-05
TSINGHUA UNIV
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Problems solved by technology

The other is a patent with the application number 01143444.9 and the publication number CN1355081A filed by the Japanese applicant on June 26, 2002, entitled "A Method for Exciting Ultrasonic Waves with Electric Arc". The plasma arc used in spraying is generated between the positive and negative poles of the spray gun, and there is no conduction between the workpiece and the spray gun, so it cannot be applied in plasma spraying

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  • Spraying method of supersonic plasma
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Embodiment Construction

[0016] Below in conjunction with accompanying drawing, describe content of the present invention in detail:

[0017] Such as figure 1 As shown, the ultrasonic plasma spraying method of the present invention only simply combines the existing plasma spraying equipment without much modification. Specific steps are as follows:

[0018] 1) Connect the ultrasonic excitation source in parallel with the positive and negative poles of the spray gun of the plasma spraying equipment; the ultrasonic excitation source can be powered separately and placed close to the workbench to shorten the wire connected to the spray gun and reduce the attenuation of the ultrasonic signal. The ultrasonic excitation source used to excite the arc to generate ultrasound is composed of a signal generation circuit, a power amplifier drive circuit, a high-speed high-power switch tube and a corresponding coupling device, which can generate alternating signals with a frequency ranging from several thousand cycl...

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Abstract

The invention is an ultrasonic plasma-spraying method, for controlling coating porosity and improving coating binding strength, including the steps: connecting an ultrasonic excitation source in parallel with the anode and cathode of the spray gun of a plasma-spraying device; electrically isolating the excitation source from the DC power supply of plasma spraying; starting a water circuit and an electric circuit of the plasma-spraying device to make high-frequency arc starting, and cooling the spray gun; turning on the excitation source to make ultrasonic alternative signal couple with plasma arc exciting signal so as to generate ultrasonic; starting a powder-feed system in the plasma-spraying device and as passing through high-temperature plasma arc, the sprayed powder is heated, and the ultrasonic acts on the plasma and simultaneously on melting sprayed powder; under the action of high-temperature plasma flame, the molten powder reaches a workpiece surface, disperses and solidifies into a coating.

Description

technical field [0001] The invention relates to the application of ultrasonic technology in plasma spraying technology, and belongs to the technical field of metal surface modification and protection. Background technique [0002] In the existing technology, there are two patents related to the present invention. One is an ultrasonic welding machine whose patent application number is 96203939 and authorized announcement number is 2258446, which includes a frame part, a pneumatic part, an ultrasonic generating part, a power supply part, and a program control part. This patented technology uses an ultrasonic focusing probe to achieve non-coupling welding of plastics. It can only weld plastic materials with high acoustic impedance and low melting point. Compared with ultrasonic plasma spraying, the introduction and application of ultrasonic has a different mechanism. The other is a patent with the application number 01143444.9 and the publication number CN1355081A filed by the...

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Application Information

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IPC IPC(8): C23C4/134
Inventor 吴敏生李路明张华堂文雄伟陆志庆张雁军何龙标
Owner TSINGHUA UNIV
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