Coating surface modification device based on thermal spraying process and working method

Abstract

The invention discloses a coating surface modification device based on a thermal spraying process and a working method. The problems of surface oxidation and non-uniformity of a coating in the prior art are solved, and the beneficial effects of reducing surface oxidation and residual stress of a workpiece are achieved. According to the specific scheme, the coating surface modification device based on the thermal spraying process comprises a shell, a spray gun and a temperature control unit. A cavity is formed in the shell, a moving mechanism is arranged on the inner side or the outer side of the shell, an opening is formed in the side portion of the shell, the moving mechanism can drive the workpiece to penetrate through the opening to move, protective gas can be introduced into the shell, and an elastic inlet and outlet mechanism is arranged on the opening side of the shell so that it can be guaranteed that the workpiece enters the cavity in the shell, and the sealing performance of the shell can be guaranteed; the spray gun is arranged on the outer side of the shell; and the temperature control unit comprises a heating control part installed on the shell so as to control the environment temperature in the shell.

Description

technical field [0001] The invention relates to the technical field of surface engineering, in particular to a coating surface modification device and working method based on a thermal spraying process. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] Plasma spraying technology uses plasma arc driven by direct current as a heat source to heat ceramics, alloys, metals and other spraying materials to a molten or semi-molten state, forming a cluster of high-speed molten particle flow (melt droplet flow), which is sprayed to the passing through at high speed. The surface of the pretreated substrate is deformed by the lateral flow of particles, rapidly cooled and solidified, and continuously deposited on the surface of the substrate to form a coating. After treatment by plasma spraying technology, the coating has a layered structure, endowing t...

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Problems solved by technology

[0004] However, conventional plasma spraying is carried out in the spraying room, and the sprayed particles are prone to oxidation during the process of spraying onto the surface of the substrate. There are oxides in the obtained coating, and the coating has a layered structure, and incomplete filling and shading effects are inevitable. Pores and cracks are generated on the surface; after spraying, the molten particles are rapidly cooled on the surface of the substrate, resulting in the inability of the liquid molten particles to fully wet the solidified particles to form a complete bond, and there are a large number of unbonded interfaces between the laminated particles; On the one hand, the rapid cooling of molten particles will cause high residual stress between the coating and the metal substrate interface, which will easily cause cracking and affect the application range and service life of the coating during service

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