Preparation method of super-hydrophobic micro-nano structure on titanium alloy surface

Abstract

The invention provides a preparation method of a super-hydrophobic micro-nano structure on a titanium alloy surface. The preparation method comprises the following steps: performing ultrasonic cleaning on a titanium alloy sample respectively with acetone and anhydrous alcohol, to obtain a titanium alloy sample with a clean surface; performing femtosecond laser photoetching processing on the surface of the titanium alloy sample with the clean surface, to obtain the titanium alloy sample with the surface having the super-hydrophobic micro-nano structure in one step, wherein a femtosecond laser beam is fixed and perpendicular to the surface of a processed material, the single pulse energy of the femtosecond laser beam is 100mu J-800mu J, the pulse width is 100fs-500fs, the central wavelength is 500nm-1000nm, the repetition frequency is 500Hz-2kHz, and the size of the etched facula of the femtosecond laser beam is 0.5mum-300mum; the surface of the titanium alloy sample moves relative to the etched facula of the femtosecond laser beam along the three-dimensional directions x, y and z, the motion positioning precision in x and y directions is 50nm-100nm, and the motion positioning precision in z direction is 5nm-10nm.

Description

technical field [0001] The invention relates to a method for preparing a superhydrophobic micro-nano structure on the surface of a titanium alloy, belonging to the technical field of material surface treatment. Background technique [0002] In recent years, the wettability of material surfaces has attracted more and more attention from researchers, and it plays a very wide role in scientific research and industrial and agricultural production. A direct measure of wettability is the measurement of the static contact angle of a liquid, usually water, on a solid surface. Generally, when the static contact angle is less than 90°, the surface is considered as a hydrophilic surface; when the static contact angle is greater than 90°, the surface is considered as a hydrophobic surface. The surface hydrophobicity also reflects the physical property that the material surface and water repel each other. When the static contact angle is greater than 150°, it is a superhydrophobic surf...

AI Technical Summary

Problems solved by technology

[0005] To sum up, some of the above-mentioned superhydrophobic surface preparation methods have complicated procedures, some require a vacuum system, the processing range is small, the efficiency is low, and the requirements for the working environment are very harsh; using etching technology, although three-dimensional morphology can be achieved However, defects such as internal stress are prone to occur in the processing area, which affects the functional characteristics of the product; for example, although the deposition technology can achieve relatively fast preparation, the controllability is extremely poor, and the resulting structural properties are unstable; The traditional photolithography technology uses ultraviolet light and masking technology for surface micromachining. This technology is highly mature, but the equipment is expensive and there are many processes.

For example, the fluorinated films with low surface energy prepared by chemical vapor deposition often have poor stability, short life, low bonding force with the metal substrate, and are easily damaged, and the preparation process is long, complicated, and expensive.

For example, the electrochemical method uses conductive metal materials such as copper and aluminum as the base material, soaks them in the corresponding reaction gas or liquid solvent, and then passes a certain current to achieve the roughened structure of the material surface through electrochemical corrosion. The method is time-consuming and difficult to obtain a uniform hydrophobic surface

For traditional laser processing with continuous laser and pulse width between nanoseconds and microseconds, the application of this type of laser is difficult due to the existence of mechanical defects such as thermal effects, melting, burrs, cracks and changes in the structure of the processed area. severely restricted

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