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Micro-nano structure preparation method on metallic material surface using femtosecond laser

A metal material, femtosecond laser technology, applied in the direction of laser welding equipment, metal processing equipment, welding equipment, etc., can solve the problems of no relevant reports, material types and processing pattern limitations, etc., and achieve the effect of obvious spectral selectivity

Inactive Publication Date: 2009-03-11
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In summary, these existing research reports use the micro / nano structure of the metal surface to control the directionality, coherence and spectral selectivity of its thermal radiation, and the thermal radiation enhancement phenomenon observed in experiments They are also concentrated in a narrow spectral range, and the enhanced thermal radiation effect in a wide spectral range has not been reported yet.
In addition, in the above-mentioned studies, the fabrication process of micro / nanostructures on the metal surface mainly relies on the planar process of traditional lithography. program, and material types and processing patterns have great limitations

Method used

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  • Micro-nano structure preparation method on metallic material surface using femtosecond laser
  • Micro-nano structure preparation method on metallic material surface using femtosecond laser
  • Micro-nano structure preparation method on metallic material surface using femtosecond laser

Examples

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Effect test

Embodiment 1

[0035] 1) Divide 10×10×2mm 3 The titanium-nickel alloy material is polished step by step with 400-800 water sandpaper, cleaned ultrasonically with deionized water, and then fixed on a three-dimensional precision mobile platform in an air environment, and the above-mentioned movement of material in spatial position;

[0036] 2) The femtosecond laser beam is used as the main optical path, and the helium-neon laser beam is used as the auxiliary optical path. After the focusing mirror reaches the surface of the metal material vertically, the femtosecond laser parameters are: pulse repetition frequency 1 kHz, pulse width 50 femtoseconds, pulse center wavelength 800 nanometers, beam polarization direction is linear polarization;

[0037] 3) Turn off the femtosecond laser beam so that only the helium-neon laser beam is irradiated at a certain position on the surface of the above-mentioned material, and then place a beam splitter at an angle of 45 degrees on the optical path away fro...

Embodiment 2

[0048] Except that the single pulse energy of the incident femtosecond laser is adjusted to 50 microjoules, other technical steps and process conditions are the same as those in Example 1. In this case, it was observed that the surface self-organization of the titanium alloy material after femtosecond laser irradiation produced a periodic stripe-like microstructure, and its atomic force micrograph is shown in figure 2 shown. The direction of the stripes of this microstructure is perpendicular to the polarization direction of the incident laser light and the scanning direction of the sample, the average interval of the stripes is 630 nanometers, the height of the stripes is about 150 nanometers, and the width is about 290 nanometers. More importantly, a large number of irregularly shaped solid particles are covered on this subwavelength grating-like microstripes, and their geometric size distribution is between tens and two hundred nanometers, which can be obtained in titanium...

Embodiment 3

[0052] Except that the energy of the incident femtosecond laser pulse is adjusted to 150 microjoules, other technical steps and process conditions are the same as in Example 1. In this case, it was observed that the surface self-organization of the titanium-nickel alloy material after femtosecond laser irradiation produced a honeycomb-like composite structure composed of subwavelength gratings and nanopores, and its scanning electron micrograph is shown in image 3 shown. Similar to the case in Example 2, the stripe direction in this composite structure is perpendicular to the laser polarization direction and the sample scanning direction, but the stripe interval varies between 400–600 nm, and the length of each group of stripes is shortened to about 1 μm . In addition, compared with the case of the microcavity in Example 1, the size of the cavities in this composite structure is significantly smaller, with a diameter of about 500 nanometers, and their distribution density in...

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Abstract

The invention discloses a method for preparing a micron / nano structure on the surface of a metal material by using femtosecond laser. The preparation steps thereof are as follows: after mechanical grinding and polishing are carried out on the surface of the metal material, then the surface is ultrasonically washed by ionized water; a femtosecond laser technique is adopted: in the air environment, a 10*micro objective is used for vertically focusing an incident femtosecond laser pulse on the surface of the material; the radius of a laser beam at the focus position is 5 microns; besides, the surface of the material is adjusted to the position which has 10 to 250 microns to the focus plane of the objective along the reverse direction of the beam, thus being capable of generating the micron / nano structure on the surface of the metal material by inducing. The method has the advantages of simple technique, being convenient and practical, no pollution and being capable of improving and enhancing the thermal radiation efficiency of the material in a broad spectrum range.

Description

(1) Technical field [0001] The invention relates to a method for preparing a micro / nano structure on the surface of a metal material, in particular to a method for preparing a micro / nano structure on the surface of a metal material by using a femtosecond laser. (2) Background technology [0002] With the increasingly scarce supply of energy today, seeking to develop new energy sources and improve the energy conversion efficiency of materials has attracted widespread attention from all over the world. As an important renewable energy source, thermal photovoltaic cells have attracted more and more attention from researchers at home and abroad due to their unique thermal-to-electrical conversion performance. In this technology, the radiation characteristics of the heat source play a very important role in the whole system. In fact, a high-quality heat radiator will greatly improve the heat-to-electricity conversion efficiency of a thermophotovoltaic system. In addition, a goo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/06B23K26/067B23K26/08B23K26/38B23K26/082B23K26/352
Inventor 杨建军杨阳梁春永王洪水
Owner NANKAI UNIV
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