Laser scribing and scanning material preparation method for dot matrix surface texture

Abstract

The invention discloses a method for preparing large-area periodicity dot-matrix type surface texture by using laser scribing scanning materials, and belongs to the field of surface microstructure preparation. According to the method for preparing the large-area periodicity dot-matrix type surface texture by using the laser scribing scanning materials, the problems of low processing efficiency and complicated technology in an existing processing method are solved. The method is suitable for all kinds of materials which damage to the materials occurs during use of laser. Laser parameters are adjusted according to the sizes of needed texture unit and the material damage threshold value before the laser is opened, a single texture unit is prepared on the surface of a sample by using single pulse laser, and the dot-matrix type texture can be prepared on the surface of the sample through a scribing scanning mode by utilizing cooperation of scanning speed, pulse frequency and duty ratio of the laser. According to the method for preparing the large-area periodicity dot-matrix type surface texture by using the laser scribing scanning materials, material surface periodicity dot-matrix type texture can be prepared more quickly in a large area, and the unit sizes and intervals are controllable. The material surface texture is wide in application such as lithium ion battery, photovoltaic power generation, infrared materials, mechanical sealing.

Description

technical field [0001] The invention relates to a method of rapidly preparing a large-area lattice texture on the surface of various materials by using laser. The texture produced by this method has regularity, periodicity and controllable size, and the most important thing is that the preparation speed is much faster than other processing methods. method. The surface texture preparation technology involved in the method belongs to the field of laser micro-nano processing. Background technique [0002] The research on the surface texture of materials originated from the bionic exploration of the special functions of biological surfaces, such as the hydrophobicity of lotus leaves and the drag reduction of shark skin to water. The surface texture of materials is widely used. For example, the Chinese invention patent CN201610534055.X pointed out that using femtosecond laser to process nanostructures on the surface of battery electrodes can greatly increase the surface area of ...

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Problems solved by technology

[0003] There are many methods for surface texture preparation, the most commonly used ones include mechanical processing, electrolytic processing, ion etching, micro-EDM, etc., but these methods have problems that are difficult to solve: the precision of mechanical processing is difficult to break through; electrolytic processing is only suitable for metal materials ; Ion etching has low efficiency and high cost; micro-EDM tool electrode loss, etc.

[0004] Chinese invention patent CN 201310375277.8 discloses a method for preparing a copper-based superhydrophobic surface texture. This method requires photolithography to form an ordered porous array template on the photoresist layer attached to the surface of the copper substrate, and then uses a two-step redox process to A layer of micro-nano double-scale structure similar to the lotus leaf surface is obtained on the surface of copper metal. The process is complicated, the cost is high, and the efficiency is low. It is only suitable for conductive materials such as metals.

Chinese invention patent CN201611094510.5 discloses that the laser marking machine prepares super-hydrophobic functional surface of aluminum alloy by dots one by one with the beam, and the single dot time is 2ms~5ms, and finally silanization treatment, the processing efficiency is low

With the rapid development of laser technology and the mature application of supporting precision instruments, the use of laser technology for material surface texture preparation has become a research hotspot. According to the report on the structure preparation method, the laser scribing and scanning method is mostly used to prepare the surface preparation of stripes or grid structures, and the lattice surface structure, except for the low efficiency structure preparation method obtained by laser point-by-point etching, for large-area periodic There is no direct preparation method for the preparation of the lattice surface structure, which often requires a more complex composite preparation process, and has the disadvantages of low efficiency, low process repeatability, and poor universality for materials.

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