A method for micropatterning metal surfaces

Abstract

The invention discloses a metal surface micro-patterning method. A transparent liquid medium not reacted with metal is adopted as protecting liquid; and in particular, when sodium hydroxide solution is adopted, the quick degradation of magnesium in water is prevented, and the machining of a magnesium alloy material by femtosecond laser filamentation in water is realized. When a flowing liquid filmis adopted, the heat dissipation condition of the periphery of a machined part can be prominently improved; and meanwhile, bubbles generated in machining are taken away to prevent accumulation of chips, so that the self-cleaning in the machining process is realized. In addition, compared with high-energy femtosecond laser filamentation in air, on the basis of guaranteeing the machining quality ofa metal surface micro-nano structure, the machining precision can be prominently improved to reach about 10 microns, and meanwhile, the production equipment cost is reduced. More importantly, an active oxidation atmosphere formed by femtosecond laser in the air is prevented, and oxides in machined products are prominently reduced, so that the metal surface and the microcosmic substance forms in machined grooves are not changed to the greatest extent.

Description

technical field [0001] A method for micro-patterning a metal surface, which belongs to the field of laser micromachining and metal surface micro-nano structure manufacturing, particularly relates to a femtosecond laser in a sodium hydroxide solution to process the surface of a degradable magnesium alloy to prepare a micro-nano structure method. Background technique [0002] In recent years, the application of femtosecond laser in the field of micro-nano structure processing on the surface of materials has become more and more extensive. Using femtosecond laser processing can prepare a variety of micro-patterned structures with grooves, peaks, nanoparticles, holes, etc. on the surface of solid materials. . At present, there are two main methods for micromachining metal surfaces using femtosecond lasers; [0003] 1. Femtosecond laser direct focus processing (that is, femtosecond laser direct writing processing in the air), the laser beam needs to make the focused laser point...

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Problems solved by technology

"It can be seen that femtosecond laser filamentation in the air cannot meet the processing requirements of higher precision

In addition, another major problem is that the femtosecond laser will form an active oxidation atmosphere in the air, resulting in a sharp increase in the oxide content in the processed area and inside the processed groove, changing the microscopic material form of the metal surface, and When filled with an inert atmosphere or other gases, it is difficult to find a transparent medium that is resistant to femtosecond laser or has no pulse width broadening as a barrier, which requires more stringent processing conditions and significantly increases processing costs.

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