Double airflow supersonic plasma spray gun

Abstract

The invention provides a double airflow supersonic plasma spray gun comprising a cathode rod, an arcing intermediate pole, an acceleration intermediate pole and an anode. Theanode is provided with a powder feeding mouth. The arcing intermediate pole, the acceleration intermediate pole and the anode are internally and coaxially provided with cavity channels which are communicated with each other and used for penetration of plasma airflow. The cathode rod is arranged in an insulated rear base. One end, which is close to the arcing intermediate pole, of the cathode rod is provided with a tungsten cathode and an argon gas distribution ring which is used for piping of argon. The insulated rear base is internally provided with a high frequency generator connector and an argon input channel which is communicated with the argon gas distribution ring. The arcing intermediate pole and the acceleration intermediate pole are arranged on an intermediate pole base, and an air gas distribution ring used for piping of mixed gas formed by air and combustible gas is arranged between the arcing intermediate pole and the acceleration intermediate pole. A problem of short service life of the cathode of pure air supersonic plasma equipment is solved, and production cost is greatly reduced in comparison with that of pure argon supersonic plasma equipment. Besides, plasma temperature and speed can be adjusted through ratio of air to combustible gas so that technology performance is high.

Description

technical field [0001] The invention relates to the technical field of thermal spraying equipment for surface engineering of modern materials, in particular to a double-flow supersonic plasma spray gun. Background technique [0002] Thermal spraying technology first appeared in Switzerland in the early 20th century. It is a method of sending coating materials (powder or wire) into some kind of heat source (electric arc, combustion flame, plasma, etc.) to melt and spray them with high-speed airflow. The process of forming a coating on the surface of a substrate material. Thermal spray coating has excellent properties such as wear resistance, corrosion resistance, high temperature resistance and heat insulation, and can repair the size reduction of parts caused by wear, corrosion or processing tolerance. It is used in military, aerospace, textile, machinery, It has been widely used in the fields of electric power and bioengineering. With the development of high technology, m...

AI Technical Summary

Problems solved by technology

Because tungsten is oxidized and burned at high temperature in the air, the hafnium cathode is used in the Ukrainian supersonic plasma spray gun. The arc starting effect and service life are very low, and the cathode needs to be replaced frequently.

Frequent cathode replacement causes spray gun wear, poor equipment and process stability, lower coating quality, etc. On the other hand, it also increases production costs and downtime losses

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