Supersonic reaction plasma spray gun

Abstract

The invention provides a supersonic reactive plasma spray gun, belonging to the welding field. The spray gun mainly comprises a gun body (1), an insulator (8), a gas swirling ring (11), a cathode body (6), an in-situ reaction Laval anode nozzle (12), a fastening sleeve (3), a front fixing cap (16), a back pressing cap (14) and an insulating gasket (5), which are in the following connection mode that: the in-situ reaction Laval anode nozzle (12) is connected with the gun body (1) through the front pressing cap (16); the gas swirling ring (11) and the insulator (8) are fixed inside the gun body (1) through the fastening sleeve (3); the fastening sleeve (3) and the gun body (1) are connected through tight fit; the cathode body (6) is fixed inside the gun body (1) through the insulator (8), the fastening sleeve (3), the back pressing cap (14) and the insulating gasket (5). The in-situ reaction Laval anode nozzle (12) is in an integrated structure on which a powder feeding hole (18), a reaction gas inlet (15), an auxiliary cooling water inlet (18) and an auxiliary cooling water channel (22) are arranged. The spray gun allows in-situ synthesis and supersonic plasma spraying to be accomplished in one step, thereby realizing the high performance, high efficiency and low cost of ceramic coating spraying and the long life-span of the spray gun.

Description

technical field [0001] The invention relates to a spraying gun, in particular to a supersonic reaction plasma spraying gun, which belongs to the field of welding. Background technique [0002] It is a common process to prepare various metal and ceramic coatings on the surface of workpieces by plasma spraying technology. As one of the plasma spraying technologies, reactive plasma spraying is being valued and developed by scholars and thermal spraying circles because of its unique process and performance characteristics. Found through literature search, patent number: CN 129881C, name: reactive plasma spraying reaction chamber device. The invention relates to a plasma spraying reaction chamber device, the structure of which consists of a plasma spray gun and a reaction chamber; the reaction chamber and the plasma spray gun are connected together by threads; The hole structure; the inner sleeve and the outer sleeve are welded together to form the main structure of the reactio...

AI Technical Summary

Problems solved by technology

However, this invention is only an improvement to the plasma spraying equipment, and does not have a real system of reactive plasma spraying equipment, nor does it realize the supersonic plasma spraying function

Therefore, the porosity of the prepared coating is relatively large, the reaction is insufficient, and the hardness of the coating does not reach the desired result, thus limiting the scope of industrial application

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