Plasma spray gun used for low-pressure plasma spraying

A plasma spray gun, low-pressure plasma technology, applied in the direction of plasma, liquid spraying equipment, coatings, etc., can solve the problems of coating quality, high powder deposition efficiency, powder accumulation and other problems, and achieve the effect of prolonging life and low plasma current
CN101954324BInactive Publication Date: 2012-05-30DALIAN MARITIME UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
DALIAN MARITIME UNIVERSITY
Publication Date
2012-05-30
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a plasma spray gun used for low-pressure plasma spraying, and belongs to spray equipment used for preparing metal and metal oxide or metal carbide coatings. The spray gun comprises a gun body, a cathode, an anode and a spray nozzle, wherein a club-shaped cathode with a conical head is arranged in the gun body; an external water-cooling cylindrical anode and an internal compressed spray nozzle which is connected with the cathode closely are arranged in front of the cathode along the axial direction; and a spray powder material is fed into the inlet of the spray nozzle, is heated and accelerated in the spray nozzle, is heated in plasma in a low-pressure environment after being sprayed out from the spray nozzle, and flies to the surface of a spraying workpiece. The positive electrode of a direct current power supply is connected with the anode while the negative electrode is connected with the cathode. The device of the invention has high powder heating capacity and is suitable for performing plasma spray in low-pressure or ultra-low-pressure environment.
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Description

technical field

[0001] The invention relates to a spraying equipment for spraying metal, metal oxide or metal carbide, in particular to a plasma spray gun. Background technique

[0002] Plasma spraying is the use of electric energy to convert mixed gases such as argon, hydrogen or helium into high-temperature plasma and form a plasma jet in the anode, and use its high-temperature and high-speed plasma gas flow to spray metal or metal oxide and metal carbide onto the workpiece. The surface, the process of forming the coating. The temperature, velocity and pressure distribution characteristics of the plasma jet strongly affect the degree of melting of powder particles injected into the plasma, the porosity and hardness of the coating. The distribution of plasma temperature and velocity outside the spray gun not only depends on the structural characteristics of the plasma generator, but also depends on the pressure of the surrounding environment outside the plasma spray gun. ...

Claims

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