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CN-117210037-B - Material with micro-nano structure surface and processing method thereof

CN117210037BCN 117210037 BCN117210037 BCN 117210037BCN-117210037-B

Abstract

The invention provides a material with a micro-nano structure surface and a processing method thereof. The micro-nano structure comprises nano protrusions and micro grooves, wherein the nano protrusions and the micro grooves are arranged on the surface of a material, the height of the nano protrusions is 0-120nm, the diameter of the bottom of the nano protrusions is 500-1000nm, the depth of the grooves is 15-70 mu m, the width of the grooves is 20-60 mu m, the interval between every two adjacent grooves is 0.1-3 mm, and the number of the nano protrusions in a grid formed by two groups of adjacent grooves is 3-400 w. The bearing steel sheet with the micro-nano structure obtained by the method has the characteristics of high adhesion and super-hydrophobic property and good mechanical wear resistance.

Inventors

  • CHEN LEI
  • YU YADONG
  • Weng ding
  • MA YUAN
  • WANG JIADAO

Assignees

  • 清华大学

Dates

Publication Date
20260505
Application Date
20230908

Claims (19)

  1. 1. A method of processing a material micro-nanostructure surface, the method comprising: a step of arranging a silica microsphere film on the surface of the material, and a step of processing a micro-nano structure on the surface of the material provided with the silica microsphere film by utilizing laser; The method comprises the steps of preparing a material, and preparing a material, wherein the step of arranging a silicon dioxide microsphere film on the surface of the material comprises the steps of preparing an alcohol-water dispersion liquid of silicon dioxide microspheres, adding the alcohol-water dispersion liquid of the silicon dioxide microspheres into water to obtain a dispersion liquid system, adding a liquid-gas interfacial tension gradient field of a sodium dodecyl benzene sulfonate hydrogel block induction system, and obtaining the silicon dioxide microsphere film through self-assembly of the silicon dioxide microspheres; the volume ratio of water to alcohol in the alcohol aqueous dispersion is 1:9-1:1; the mass concentration of the silicon dioxide is 1.5-3.5wt% based on 100% of the total mass of the alcohol-water dispersion liquid of the silicon dioxide microspheres; the step of adding the silica microsphere alcohol aqueous dispersion into water is to add the silica microsphere alcohol aqueous dispersion into water according to the proportion of water=1/1200-1/600; The material is metal; The step of processing the micro-nano structure on the surface of the material provided with the silicon dioxide microsphere film by utilizing laser comprises the steps of firstly carrying out laser processing on the surface of the material provided with the silicon dioxide microsphere film at a non-focal position of a laser lens to obtain nano bulges; the sodium dodecyl benzene sulfonate hydrogel block is prepared by a method comprising the following steps: The method comprises the steps of taking sodium dodecyl benzene sulfonate, acrylamide and N, N '-methylene bisacrylamide as raw materials, carrying out cross-linking reaction in deionized water in the presence of ammonium persulfate and N, N, N', N '-tetramethylene ethylenediamine to obtain sodium dodecyl benzene sulfonate hydrogel blocks, wherein the mass ratio of the sodium dodecyl benzene sulfonate to the acrylamide to the N, N' -methylene bisacrylamide to the ammonium persulfate to the N, N, N ', N' -tetramethylene ethylenediamine to the deionized water is (0.1-15) (0.1-20) (0.001-6) (0.001-3) (0.001-5) (1-30), and the cross-linking reaction is carried out for 8-15 h at 20-90 ℃.
  2. 2. The method according to claim 1, wherein the volume ratio of water to alcohol in the aqueous alcohol dispersion is 1.5:8.5 to 4.5:5.5.
  3. 3. The processing method according to claim 1, wherein the volume ratio of water to alcohol in the aqueous alcohol dispersion is 2:8 to 4:6.
  4. 4. The method according to claim 1, wherein the silica is hydrophobic silica, and the contact angle of the hydrophobic silica is 120 ° to 140 °.
  5. 5. The process of claim 1, wherein the mass ratio of sodium dodecylbenzenesulfonate, acrylamide, N, N ' -methylenebisacrylamide, ammonium persulfate, N, N, N ', N ' -tetramethylenediamine and deionized water is (0.5-12): 0.5-16): 0.005-5): 0.005-2: 5-26: 0.002-4.
  6. 6. The process of claim 1, wherein the mass ratio of sodium dodecylbenzenesulfonate, acrylamide, N, N ' -methylenebisacrylamide, ammonium persulfate, N, N, N ', N ' -tetramethylenediamine and deionized water is (1-9): 1-12): 0.012-3): 0.01-1.5): 0.003-3: 8-24.
  7. 7. The process of claim 1, wherein the sodium dodecyl benzene sulfonate hydrogel block is prepared by a process comprising the steps of: Sodium dodecyl benzene sulfonate, acrylamide and N, N ' -methylene bisacrylamide are used as raw materials, in the presence of ammonium persulfate and N, N, N ', N ' -tetramethylene ethylenediamine, the raw materials are stirred for 0.1 to 5 hours at the normal temperature under the rotation speed of 200 to 900rpm in deionized water, and then the crosslinking reaction is carried out to obtain the sodium dodecyl benzene sulfonate hydrogel block.
  8. 8. The processing method according to claim 1, further comprising heating at 20-110 ℃ for 8-30 hours to remove water in the reaction system after the crosslinking reaction, and then obtaining the sodium dodecyl benzene sulfonate hydrogel block.
  9. 9. The processing method according to any one of claims 1 to 8, wherein, The laser processing parameters in the step of performing laser processing to obtain the nano-projections include: The laser wavelength is 343nm, 515nm or 1030nm, and the focal length of the lens is 90-160mm; The laser processing is performed under the state of 0.2-3mm of defocusing; the scanning speed of the laser is 1-9mm/s, and the scanning track interval is 0.15-0.45mm; the repetition frequency of the laser is 1-200kHz; the average power of the laser is 80-200mW; the laser processing parameters in the step of performing laser processing to obtain the micron grooves include: The wavelength of the laser is 343nm, 515nm or 1030nm, and the focal length of the lens is 90-160mm; the scanning track interval of the laser processing is 0.15-0.45mm; The scanning speed of the laser is 1-9mm/s, and the laser is processed at the position of the focus under the lens; the repetition frequency of the laser is 1-200kHz; the average power of the laser is 0.5% -100% of the total energy of the system laser.
  10. 10. The processing method according to claim 9, wherein the laser processing route in the step of performing laser processing to obtain nano-projections is a reverse-folded curve, and the laser processing route in the step of performing laser processing to obtain micro-grooves is a grid.
  11. 11. The processing method according to any one of claims 1 to 8, further comprising polishing and cleaning the material, and then providing a silica microsphere film on the surface of the material, wherein the polishing comprises polishing the surface of the material to a Sa value of 0 to 0.1 μm, and the cleaning comprises sequentially cleaning the polished surface of the material with acetone, ethanol and water.
  12. 12. The processing method according to any one of claims 1 to 8, wherein the processing method further comprises a step of performing a hydrophobic treatment on the surface of the processed micro-nano structure material, and the step of performing the hydrophobic treatment on the surface of the material by using 1h,2 h-perfluorooctyl triethoxysilane.
  13. 13. The method of processing according to claim 12, wherein the step of subjecting the surface of the processed micro-nano structured material to a hydrophobic treatment comprises immersing the processed micro-nano structured material in an ethanol solution of 1h,2 h-perfluorooctyl triethoxysilane, standing, and then vacuum drying to obtain the hydrophobically modified material having a micro-nano structured surface.
  14. 14. The process according to claim 12, wherein the mass concentration of 1h,2 h-perfluorooctyltriethoxysilane in the ethanol solution of 1h,2 h-perfluorooctyltriethoxysilane is 0.5-15%.
  15. 15. The process of claim 12, wherein the micro-nano structured material is immersed in an ethanol solution of 1h,2 h-perfluorooctyltriethoxysilane for 1-80min.
  16. 16. The process of claim 12, wherein the vacuum drying is at 20-110 ℃ for 5-50min.
  17. 17. The processing method according to any one of claims 1 to 8, wherein the material is steel.
  18. 18. The processing method according to any one of claims 1 to 8, wherein the material is bearing steel.
  19. 19. The material with the micro-nano structure surface, which is obtained by the processing method according to any one of claims 1-18, wherein the micro-nano structure comprises nano protrusions and micro grooves which are arranged on the surface of the material, the height of the nano protrusions is 20-120nm, the bottom diameter is 500-1000nm, the groove depth is 15-70 mu m, the groove width is 20-60 mu m, the interval between every two adjacent grooves is 0.1-3 mm, and the number of the nano protrusions in a grid formed by two groups of adjacent grooves is 3-400 w.

Description

Material with micro-nano structure surface and processing method thereof Technical Field The invention relates to the technical field of laser near-field processing, in particular to a material with a micro-nano structure surface and a processing method thereof. Background In recent years, inspired by biological characteristics in nature, research on micro-nano patterned surfaces has received great attention and has been widely applied to practical engineering. Such as anti-reflection structures, colored, anti-icing surfaces, self-cleaning surfaces, fluid delivery, SERS substrate fabrication, etc., of solar panels, exhibit broad application prospects. Considerable effort has been made by researchers in the preparation of hydrophobic micro-nano composite structures, and common techniques include electrodeposition, chemical deposition, selective mask deposition, laser direct writing, etc., but these methods have limitations of using too many harmful chemical reagents with high cost or environmental pollution and lower optical imaging resolution. The microsphere in the laser near field processing technology can manipulate light in a novel mode which cannot be realized by a traditional optical element, so that the characteristic dimension of sub-100 nm is realized, meanwhile, the micro-nano structure of the laser near field processing has the advantages of controllability, high efficiency, capability of realizing programming and large-area processing, environment friendliness, and increased wear resistance while increasing hydrophobicity. The present invention has been made in view of the above-described circumstances. Disclosure of Invention An object of the present invention is to provide a material having a micro-nanostructured surface; Another object of the present invention is to provide a method for processing a micro-nano structured surface of a material The invention also aims at providing the material with the micro-nano structure surface obtained by the processing method. In order to achieve the above purpose, in one aspect, the invention provides a material with a micro-nano structure surface, wherein the micro-nano structure comprises nano protrusions and micro grooves arranged on the material surface, the height of the nano protrusions is 20-120nm, the bottom diameter is 500-1000nm, the groove depth is 15-70 μm, the groove width is 20-60 μm, the interval between adjacent grooves is 0.1 mm-3 mm, and the number of the nano protrusions in a grid formed by two groups of adjacent grooves is 3 w-400 w. According to some embodiments of the invention, the material is a metal (sheet, strip or block material, etc., such as a metal sheet, strip or block). According to some embodiments of the invention, the material is a steel material, an aluminum material, a silicon material, or a copper material. According to some embodiments of the invention, the material is bearing steel. According to some embodiments of the invention, the material is 9Cr18 bearing steel. In another aspect, the present invention further provides a method for processing a surface of a micro-nano structure of a material, the method comprising: a step of arranging a silica microsphere film on the surface of the material, and a step of processing a micro-nano structure on the surface of the material provided with the silica microsphere film by utilizing laser; The method comprises the steps of preparing a material, and preparing a material, wherein the step of arranging a silicon dioxide microsphere film on the surface of the material comprises the steps of preparing an alcohol-water dispersion liquid of silicon dioxide microspheres, adding the alcohol-water dispersion liquid of the silicon dioxide microspheres into water to obtain a dispersion liquid system, adding a liquid-gas interfacial tension gradient field of a sodium dodecyl benzene sulfonate hydrogel block induction system, and obtaining the silicon dioxide microsphere film through self-assembly of the silicon dioxide microspheres; The volume ratio of water to alcohol in the aqueous alcohol dispersion is 1:9-1:1. The invention uses the liquid-gas interfacial tension gradient field of the sodium dodecyl benzene sulfonate hydrogel block induction system, and the sodium dodecyl benzene sulfonate hydrogel block can be placed in a dispersion system (a system consisting of silicon dioxide microsphere dispersion liquid and water) for a period of time (which can be 2-60 seconds, preferably 2-10 seconds), and then taken out. The sodium dodecyl benzene sulfonate hydrogel block of the invention can be reused after being taken out. The invention can promote the silicon dioxide microspheres to be efficiently and orderly arranged into a single-layer film through self-assembly by inducing the sodium dodecyl benzene sulfonate hydrogel blocks. According to some embodiments of the invention, the aqueous dispersion of silica microspheres in alcohol is stably added to water at a constant speed. Accordin