CN113308600A - Hydrophobic coating based laser shock method - Google Patents

Hydrophobic coating based laser shock method Download PDF

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Publication number
CN113308600A
CN113308600A CN202110543364.4A CN202110543364A CN113308600A CN 113308600 A CN113308600 A CN 113308600A CN 202110543364 A CN202110543364 A CN 202110543364A CN 113308600 A CN113308600 A CN 113308600A
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hydrophobic
layer
laser
absorption layer
liquid drop
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CN113308600B (en
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胡耀武
刘健
张啸寒
夏敏
刘胜
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Wuhan University WHU
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Wuhan University WHU
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D10/00—Modifying the physical properties by methods other than heat treatment or deformation
    • C21D10/005—Modifying the physical properties by methods other than heat treatment or deformation by laser shock processing
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F3/00—Changing the physical structure of non-ferrous metals or alloys by special physical methods, e.g. treatment with neutrons

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  • Engineering & Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Thermal Sciences (AREA)
  • Laser Beam Processing (AREA)

Abstract

The invention discloses a laser shock method based on a hydrophobic coating, which comprises the steps of coating a hydrophobic or super-hydrophobic material on the surface of a traditional common absorption layer to prepare a hydrophobic absorption layer, combining a liquid drop restraint layer method, paving a high-flexibility liquid drop restraint layer on the surface of the absorption layer at room temperature, and utilizing the secondary focusing effect of liquid drops on laser to further realize a laser shock technology strengthened by the liquid drop restraint layer at room temperature. The invention can realize continuous laying of the restraint layer in the continuous laser impact process at room temperature, and can realize low energy consumption, low cost, high quality and high efficiency laser impact manufacture.

Description

Hydrophobic coating based laser shock method
Technical Field
The invention relates to the field of advanced laser manufacturing, in particular to a laser impact method based on a hydrophobic coating.
Background
The laser shock strengthening technology is a high and new technology for improving the fatigue resistance, wear resistance and corrosion resistance of metal materials by using plasma shock waves generated by strong laser beams. In recent thirty years, laser shock technology has rapidly developed under the impetus of increasingly advanced lasers and advanced manufacturing technologies, and is considered to be a processing technology with great potential to replace shot peening technology. The application of the laser shock technology is gradually expanded from the field of laser shock strengthening to micro-nano manufacturing and composite manufacturing.
At present, laser with high power density (GW/cm magnitude) and short pulse (10-30 ns magnitude) is impacted by laser to act on an energy absorption layer coated on a metal surface through a transparent constraint layer, and the absorption layer absorbs laser energy and quickly gasifies and almost simultaneously forms a large amount of dense high-temperature (>10K) and high-pressure (>1GPa) plasmas. The plasma continues to absorb laser energy and rapidly rises in temperature to expand, and then the plasma explodes to form high-strength shock waves to act on the metal surface. When the peak pressure of the shock wave exceeds the dynamic yield strength of the material, the material plastically deforms and creates a compressive stress perpendicular to the surface of the material at the surface layer. In this process, the confinement layer plays a decisive role in the magnitude of the shock wave pressure, since the confinement layer, in addition to confining the expansion of the plasma and thus increasing the peak pressure of the shock wave, also prolongs its action time by reflection of the shock wave. The constraining layers commonly used today are running water and K9 glass. However, the laser shock method using transparent glass as the constraint layer has the obvious disadvantages of high breakage rate, being not beneficial to the large-size continuous laser shock process, low recycling rate, and difficult processing of the constraint layer laid on a curved surface or an uneven area. Although the strategy of using a flowing water layer as a constraining layer can solve these textures, in the case of large-size surface laser shock peening, water resources are wasted. Therefore, designing a continuously usable, highly efficient, pollution-free confinement layer remains a technical problem to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings of the prior art and provide a laser shock method based on a hydrophobic coating, which can realize continuous laying of a restraint layer in a room-temperature continuous laser shock strengthening process and can realize low-energy consumption, low-cost, high-quality and high-efficiency laser shock manufacturing.
In order to achieve the above object, the present invention provides a laser shock method based on hydrophobic coating: the method specifically comprises the following steps:
the hydrophobic absorption layer is prepared by coating the hydrophobic coating on the surface of a traditional common absorption layer, the laying of the high-flexibility liquid drop restraint layer on the surface of the absorption layer is realized at room temperature by combining a liquid drop restraint layer laying technology, the energy density of pulse laser is improved by utilizing the secondary focusing effect of the liquid drop restraint layer on the pulse laser, and the laser impact technology reinforced by the liquid drop restraint layer at room temperature is adopted. The method specifically comprises the following steps:
s1: coating a hydrophobic coating;
s2: paving and fixing materials;
s3: setting laser impact parameters;
s4: laying a liquid drop restraint layer;
s4: laser shock is performed.
Preferably, in the step S1, the hydrophobic coating is applied by coating a hydrophobic or super-hydrophobic material on the surface of the absorbing layer, and the hydrophobic coating is laid to change the wettability of the absorbing layer to prepare a hydrophobic absorbing layer, so as to ensure that the liquid drops on the surface of the absorbing layer are approximately spherical at room temperature.
Further, the hydrophobic or superhydrophobic material can be, but is not limited to, PTFE, fluorinated polyethylene, fluorocarbon wax or other synthetic fluoropolymers, polyolefins, polycarbonates, polyamides, polyacrylonitrile, palmitic acid, polyesters, non-fluorinated acrylates, molten paraffin wax or other synthetic high molecular melt polymers.
Furthermore, in the step S2, the material laying and fixing step includes laying a target material and a hydrophobic absorption layer in sequence in the processing area, and fixing the material position by using a fixture.
Furthermore, the laser shock parameter setting in step S3 includes laser parameters and droplet confinement layer laying parameters; the laser parameters comprise laser energy, laser spots and laser frequency, and the parameters of the liquid drop restraint layer comprise the diameter of the liquid drop and the laying frequency of the liquid drop.
Furthermore, in the step S4, the laying step of the liquid drop restriction layer is to use transparent liquid drops as the restriction layer, and the liquid drops exist in a spherical shape or an oblate spheroid shape on the surface of the super-hydrophobic absorbent layer.
Further, the chemical composition of the droplet confinement layer may be, but is not limited to, water, ethanol, hydrogen peroxide, and acetone.
Furthermore, the liquid drop laying frequency is adjusted according to the pulse frequency, and the liquid drop restraint layer laying and the laser impact link are ensured to be carried out in a coordinated mode.
Further, the liquid drop restriction layer can be laid by, but not limited to, dripping or spraying.
Compared with the prior laser shock technology, the invention has the following advantages and beneficial effects:
the laser impact method based on the hydrophobic coating combines the absorption layer with the super-hydrophobic characteristic and the liquid drop restraint layer, can avoid the problem of crushing the glass restraint layer, can realize the laying of the spherical liquid drop restraint layer at room temperature, and is suitable for the laser impact treatment of large-size surfaces. In addition, the hydrophobic coating-based laser impact method provided by the invention can increase the laser energy density and improve the laser impact effect by utilizing the secondary focusing effect of the transparent liquid drops. The laser impact technology can be realized without temperature assistance and laser impact equipment transformation, is simple and convenient to operate, and has the characteristics of high flexibility and high efficiency.
Drawings
FIG. 1 is a process diagram of a laser shock method based on a hydrophobic absorption layer according to the present invention;
in fig. 1: 1. pulse laser; 2. a droplet confinement layer; 3. a super-hydrophobic coating; 4. an absorbing layer; 5. a metal target material; 6. a test platform; 7. and (4) clamping.
FIG. 2 is a comparison graph of surface wettability of an absorbent layer with and without a hydrophobic coating;
in fig. 2: (a) no hydrophobic coating and (b) a hydrophobic coating.
FIG. 3 is a comparison of laser shock peening hardness tests for different constraining layers.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited thereto.
Example 1
As shown in fig. 1, the laser shock method for hydrophobic coating in this embodiment specifically includes the following steps:
s1: and (4) coating a hydrophobic coating. The hydrophobic coating 3 is prepared by uniformly coating the surface of the absorption layer 4 with a hydrophobic or super-hydrophobic material, and in this embodiment, the material of the hydrophobic coating 3 is Palmitic Acid (PA).
S2: and (5) laying and fixing materials. The metal target 5 is horizontally placed on an experiment platform 6, the absorption layer 4 is horizontally laid on the surface of the metal target 5, and the metal target 5, the absorption layer 4 and the hydrophobic coating 3 are compressed through a clamp 7 by utilizing the clamp 7 so as to reduce the layer gap. The droplet 2 is dripped into the action area of the pulse laser 1 by using a droplet laying device. In this embodiment, the metal target 5 is a 7075 aluminum alloy thin plate with a thickness of 2mm, and the absorption layer 4 is an Al foil.
S3: and setting laser impact parameters. The energy of the pulse laser 1 was 1J, the frequency was 1HZ, the spot diameter was 2mm, the droplet 2 was set to be a droplet of 2mm in diameter, and the droplet laying frequency was set to be 1 HZ.
S4: and laying a liquid drop restraint layer. In this embodiment, the liquid drop is laid by using a peristaltic pump, and the laying mode is set to drip.
S5: laser shock is performed. And starting the pulse laser and executing the laser shock peening process.
In addition, this example set a control group having K9 glass as a constraining layer and aluminum foil as an absorbing layer as comparative examples, and tested the microhardness after laser shock.
As can be seen from the comparison of wettability of the surface of the absorbent layer with or without the super-hydrophobic coating laid thereon in fig. 2, the wetting angle of the liquid droplets on the surface of the absorbent layer 4 not coated with the hydrophobic material is 67.4 °, the absorbent layer is hydrophilic, while the liquid droplets on the surface of the absorbent layer 4 coated with the hydrophobic coating 3 are approximately spherical, the wetting angle thereof is 106.5 °, and the liquid droplets are hydrophobic. The method for realizing the laying of the high-curvature spherical liquid drop restraint layer by changing the wettability of the absorption layer at room temperature based on the laying of the hydrophobic coating is proved to be real and effective, and the realization method is simple and convenient.
Comparative microhardness in FIG. 3As can be seen from the results of the degree test, the micro-hardness of the 7075 aluminum alloy sheet on which the laser punching and strengthening were not performed was 203HV0.1The hardness of the 7075Al alloy after the traditional laser shock strengthening by taking K9 glass as a restraint layer is 269HV0.1The maximum microhardness of the aluminum alloy subjected to laser shock strengthening treatment by the laser shock method based on the super-hydrophobic coating is about 360HV0.1. The hydrophobic coating-based laser impact method provided by the invention is proved to be capable of effectively utilizing the secondary focusing effect of the transparent spherical liquid drop to greatly improve the laser impact effect.
Therefore, the laser shock peening method based on the hydrophobic constraint layer provided by the invention has the advantages that the super-hydrophobic material is utilized, the wettability of the absorption layer is changed, and the liquid drop constraint layer is combined, so that the problems of low repeated utilization rate, poor flexibility and the like of the traditional constraint layer are solved, and meanwhile, the laser shock peening effect can be effectively improved.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.

Claims (9)

1. A laser shock method based on a hydrophobic absorption layer is characterized in that: the method comprises the steps of coating a hydrophobic coating on the surface of a traditional common absorption layer to prepare a hydrophobic absorption layer, combining a liquid drop restraint layer laying technology, realizing the laying of a high-flexibility liquid drop restraint layer on the surface of the absorption layer at room temperature, improving the energy density of pulse laser by utilizing the secondary focusing effect of the liquid drop restraint layer on the pulse laser, and being a laser impact technology for realizing the reinforcement of the liquid drop restraint layer at room temperature; the method comprises the following steps:
s1: coating a hydrophobic coating;
s2: paving and fixing materials;
s3: setting laser impact parameters;
s4: laying a liquid drop restraint layer;
s5: laser shock is performed.
2. The hydrophobic absorption layer based laser shock method according to claim 1, wherein: in the step S1, the hydrophobic coating layer coating step is to coat a hydrophobic or super-hydrophobic material on the surface of the absorption layer, change the wettability of the absorption layer by laying the hydrophobic coating layer, prepare the hydrophobic absorption layer, and ensure that the liquid drops on the surface of the absorption layer are approximately spherical at room temperature.
3. The hydrophobic absorption layer based laser shock method of claim 2, wherein: the hydrophobic or super-hydrophobic material is any one of PTFE, fluorinated polyethylene, fluorocarbon wax or other synthetic fluorine-containing polymers, polyolefin, polycarbonate, polyamide, polyacrylonitrile, palmitic acid, polyester, fluorine-free acrylate, molten paraffin or other synthetic high-molecular melt polymers.
4. The hydrophobic absorption layer based laser shock method according to any of claims 1 to 3, characterized in that: in the step S2, the material laying and fixing step includes laying the target material and the hydrophobic absorption layer in sequence in the processing area, and fixing the material position by using the fixture.
5. The hydrophobic absorption layer based laser shock method according to claim 4, wherein: in the step S3, the laser shock parameter setting includes laser parameters and droplet confinement layer laying parameters; the laser parameters comprise laser energy, laser spots and laser frequency, and the parameters of the liquid drop restraint layer comprise the diameter of the liquid drop and the laying frequency of the liquid drop.
6. The hydrophobic absorption layer based laser shock method of claim 5, wherein: in the step S4, the liquid drop restriction layer is laid by using transparent liquid drops as the restriction layer, and the liquid drops exist in a spherical or oblate spherical shape on the surface of the super-hydrophobic absorbent layer.
7. The hydrophobic absorption layer based laser shock method of claim 6, wherein: the liquid drop restraint layer comprises any one of water, ethanol, hydrogen peroxide and acetone as a chemical component.
8. The hydrophobic absorption layer based laser shock method according to any of claims 5 to 7, wherein: the laying frequency of the liquid drop restraint layer is adjusted according to the pulse laser frequency so as to ensure that the laying of the liquid drop restraint layer and the laser impact link are carried out in a coordinated manner.
9. The hydrophobic absorption layer based laser shock method of claim 8, wherein: the liquid drop restraint layer is laid in a dripping or spraying mode.
CN202110543364.4A 2021-05-17 2021-05-19 Hydrophobic coating based laser shock method Active CN113308600B (en)

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PCT/CN2022/087051 WO2022242384A1 (en) 2021-05-17 2022-04-15 Droplet confinement-based laser shock method and application thereof

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114406475A (en) * 2021-12-01 2022-04-29 江苏大学 Method for preparing aluminum alloy super-hydrophobic surface by laser shot blasting
WO2022242384A1 (en) * 2021-05-17 2022-11-24 武汉大学 Droplet confinement-based laser shock method and application thereof

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CN111014959A (en) * 2019-12-30 2020-04-17 东华大学 Bionic surface preparation method based on laser impact imprinting technology
CN111850284A (en) * 2019-04-26 2020-10-30 中国科学院宁波材料技术与工程研究所 Laser shock peening method and system

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US20050105939A1 (en) * 2003-11-18 2005-05-19 Eastman Kodak Company Electrostatographic apparatus having transport member with release oil-absorbing layer
US20110228890A1 (en) * 2005-02-22 2011-09-22 Synergy Innovations, Inc. System and method for creating liquid droplet impact forced collapse of laser nanoparticle nucleated cavities
CN107436488A (en) * 2016-05-27 2017-12-05 中国科学院宁波材料技术与工程研究所 Laser impact intensified system and its focusing restraint device
WO2018015650A1 (en) * 2016-07-18 2018-01-25 Essilor International (Compagnie Générale d'Optique) Method for permanent visible marking of an optical article and marked optical article
CN111850284A (en) * 2019-04-26 2020-10-30 中国科学院宁波材料技术与工程研究所 Laser shock peening method and system
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Cited By (4)

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Publication number Priority date Publication date Assignee Title
WO2022242384A1 (en) * 2021-05-17 2022-11-24 武汉大学 Droplet confinement-based laser shock method and application thereof
CN114406475A (en) * 2021-12-01 2022-04-29 江苏大学 Method for preparing aluminum alloy super-hydrophobic surface by laser shot blasting
WO2023098084A1 (en) * 2021-12-01 2023-06-08 江苏大学 Method for preparing aluminum alloy superhydrophobic surface by laser peening
CN114406475B (en) * 2021-12-01 2023-09-22 江苏大学 Method for preparing aluminum alloy super-hydrophobic surface by laser shot blasting

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