Bionic metal ultra-wetting trans-scale structure design method and preparation method

Abstract

The invention relates to the technical field of laser microprocessing, in particular to a method for obtaining a metal-based ultra-wetting surface by designing the trans-scale structure of a metal surface, preparing a laser microstructure on the metal surface and carrying out necessary ultra-wetting decoration to the metal surface. The method comprises the following steps: firstly, designing a macroscopical large-area superficial periodical mastoid structure which simulates a locus leaf surface; constructing a micronano periodical structure on the microstructure of the mastoid structure to obtain a macroscopical-micronano trans-scale geometric model; adjusting laser parameters and a laser scanning path according to geometric parameters acquired after the bionic metal ultra-wetting trans-scale structure is designed; scanning the plane first time; rotating a sample 90 degrees; and scanning the plane again with low-energy laser. The trans-scale microstructure approaches to the surface appearance of a natural organism, is easy to calculate and analyze a contact angle and has a simple and controllable preparation process.

Description

technical field [0001] The invention relates to the technical field of laser micromachining, in particular to the design of the cross-scale structure of the metal surface, the preparation of the laser microstructure on the metal surface, and the method of superwetting the microstructure surface to obtain a metal-based superwetting surface if necessary. It is especially suitable for the design and preparation of super-wetting cross-scale structures of metals such as steel, Ti and its alloys, Cu and its alloys, Ni and its alloys, and can be used for self-cleaning of material surfaces, liquid flow drag reduction, biocompatibility, etc. aspects of application. Background technique [0002] Superwetting surfaces include superhydrophobic surfaces and superhydrophilic surfaces. Super-hydrophobic surface refers to the surface whose contact angle with water is greater than 150° and the roll-off angle is less than 10°. Wide range of applications. Super-hydrophilic surface means tha...

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Problems solved by technology

[0004] However, in the design and preparation of bionic cross-scale microstructures, there is generally a phenomenon that the structure design and the preparation results are out of touch. The design is limited to relatively regular structures, such as columnar, grating, granular and other structures. angle, but it is quite different from the natural cross-scale structure, such as the Chinese patent "Laser preparation method of metal-based superhydrophobic microstructure surface" (public number CN101219506A); and some prepared natural cross-scale microstructures are similar The structure of the structure is often an irregular structure, which is difficult to geometrically model, so it is difficult to determine the true wetting state by assuming its wetting state, calculating its contact angle, and comparing the calculation results with the experimental results, such as Anne-Marie Paper "Patterned Superhydrophobic Metallic Surfaces" by Kietzig et al.

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