Method for preparing coating on workpiece surface through laser shock peening technology

Abstract

The invention discloses a method for preparing a coating on the workpiece surface through the laser shock peening technology and belongs to the technical field of material modification. According to the method, firstly, coating powder is uniformly smeared on an absorbing layer material used in the laser shock peening process; the absorbing layer material coated with the coating powder is deposited on a to-be-sprayed workpiece, laser shock peening treatment is conducted on an absorbing layer through a pulsed nanosecond Nd:YAG laser, and lasers are output after beam shaping; the coating powder on the surface of the absorption layer is embedded into the workpiece surface in a shocked mode, and thus the required coating is prepared on the workpiece surface. The coating prepared through the method is uniform, high in bonding strength with a base material, and not limited by the shape of the workpiece, and the method is suitable for preparing the coating on the surface of the workpiece with the complex shape.

Description

technical field [0001] The invention belongs to the technical field of material modification, and in particular relates to a method for preparing a coating on the surface of a workpiece by using a laser shock strengthening technology, which is applied in the fields of aerospace, deep-sea diving, and weapon military industry. Background technique [0002] Among the surface spraying techniques, the explosive spraying technique has the most obvious effect. The inevitable disadvantages are also very obvious: the noise generated by explosive spraying is as high as 180dB, which is much higher than other spraying methods, and it needs to be carried out in a special soundproof room, and the operator operates remotely through a computer outside; a large amount of dust will be generated during explosive spraying Diffusion, dust-proof equipment is required; due to the controllable "explosion" of small areas involving gas in the process, there is a certain degree of danger. The frequenc...

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Problems solved by technology

The inevitable disadvantages are also very obvious: the noise generated by explosive spraying is as high as 180dB, which is much higher than other spraying methods, and it needs to be carried out in a special soundproof room, and the operator operates remotely through a computer outside; a large amount of dust will be generated during explosive spraying Diffusion, dust-proof equipment is required; due to the controllable "explosion" of small areas involving gas in the process, there is a certain degree of danger. The frequency of explosive spraying is 1 to 10 times / s, and after each detonation wave cycle The preparation diameter is equivalent to the barrel diameter (generally about 20mm), and the thickness is about 5-20μm. Therefore, explosive spraying will be limited by the shape of the workpiece to be sprayed. For workpieces with complex shapes, such as the inner wall of holes, it is difficult to use explosive spraying; because American companies strictly restrict the export of this technology and equipment, there are very few such equipment in China. , so there is no systematic and in-depth research on this technology, and the application field is narrower than other thermal spraying technologies

However, there are no related reports on the preparation of coatings on the surface of materials using laser shock peening technology.

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