Nanosecond laser ablation and chemical thermal decomposition compound preparation method for stainless steel surface super-hydrophobic micro-nano structures

A technology of micro-nano structure and laser ablation, which is applied in the direction of nanotechnology for materials and surface science, laser welding equipment, and devices for coating liquid on the surface, etc. It can solve the problems of reducing surface energy, high cost, and stainless steel superhydrophobic Long preparation period of micro-nano structure and other issues, achieve low cost, low cost, and shorten the preparation period

Active Publication Date: 2020-01-07
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention solves the defects of long preparation period, high cost and the use of fluorine-containing chemical reagents to reduce the surface energy of the stainless steel super-hydrophobic micro-nano structure

Method used

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  • Nanosecond laser ablation and chemical thermal decomposition compound preparation method for stainless steel surface super-hydrophobic micro-nano structures
  • Nanosecond laser ablation and chemical thermal decomposition compound preparation method for stainless steel surface super-hydrophobic micro-nano structures
  • Nanosecond laser ablation and chemical thermal decomposition compound preparation method for stainless steel surface super-hydrophobic micro-nano structures

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preparation example Construction

[0037] As introduced in the background art, the current methods for preparing surface superhydrophobic micro-nano structures have the problems of long cycle time or environmental pollution. Therefore, the present invention proposes a composite preparation method of nanosecond laser ablation and chemical thermal decomposition of a super-hydrophobic micro-nano structure on the surface of stainless steel, comprising the following steps:

[0038] Step (1): pretreatment, the stainless steel sample is ultrasonically cleaned with absolute ethanol to remove surface oil and impurities, and air-dried at room temperature.

[0039] Step (2): Place the cleaned and air-dried workpiece in step 1 on the infrared nanosecond laser processing platform; adjust the laser focus to the upper surface of the workpiece, and carry out equidistant linear scanning.

[0040] Step (3): Configure ethanol solution of stearic acid, pour the solution into the ultrasonic atomizer, start the ultrasonic atomizer,...

Embodiment 1

[0050] (1) Pretreatment, the 10mm×10mm×2mm stainless steel sample was ultrasonically cleaned in absolute ethanol for 5 minutes to remove surface oil and impurities, and air-dried at room temperature.

[0051] (2) Infrared nanosecond laser ablation for the first time: see attached figure 1 , place the pretreated workpiece on the infrared nanosecond laser processing platform; adjust the laser focus to the upper surface of the workpiece, set the average laser power to 20W, the pulse frequency to 100kHz, the scanning speed to 2000mm / min, and the laser scanning distance to 25μm .

[0052] (3) Stearic acid particle deposition: see attached figure 1 , use the ultrasonic atomization device to atomize the absolute ethanol solution of stearic acid with a mass ratio of 3%, and spray a layer of stearic acid ethanol solution micro-droplets evenly on the surface of the sample. The moving speed of the ultrasonic atomization device is 2000mm / min, 30mm away from the surface of the workpiece,...

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Abstract

The invention relates to a nanosecond laser ablation and chemical thermal decomposition compound preparation method for stainless steel surface super-hydrophobic micro-nano structures, belongs to thetechnical field of material surface modification, and solves the defects of long preparation period and complex process flow of stainless steel super-hydrophobic surfaces; and fluorine-contained chemical reagents are not used for modification, so that prepared super-hydrophobic micro-nano structures are excellent in quality and stability. The method comprises the following steps: (1) stainless steel samples are ultrasonically cleaned in anhydrous ethanol and aired at a room temperature; (2) the primary infrared nanosecond laser ablation is performed on the samples to obtain micro-nano structures; (3) an ultrasonic atomizer is used for uniformly coating the surfaces of workpieces with stearic acid ethanol solution microdroplets; (4) the secondary infrared nanosecond laser ablation is performed on the samples; and (5) the samples are separately and ultrasonically cleaned by acetone, anhydrous ethanol and de-ionized water by 10 minutes to remove undecomposed stearic acid attached to the surfaces and slag generated by the laser ablation so as to obtain stainless steel super-hydrophobic surfaces with stable super-hydrophobic properties.

Description

technical field [0001] The invention belongs to the technical field of material surface modification, is an improvement technology for the super-hydrophobic surface of stainless steel materials, and specifically relates to a composite method of nanosecond laser ablation and chemical thermal decomposition. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Stainless steel materials are widely used in medical devices (such as surgical instruments, medical trays, etc.), ships (propellers, cargo holds, etc.), aerospace (aircraft structural parts, chemical fuel pressure vessels, etc.) and other fields. Stainless steel itself is a hydrophilic material, and its static contact angle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/352B23H5/00
CPCB23K26/355B23H5/00B05D2202/15B05D5/08B05D5/02B05D2350/33B05D1/12B05D3/06B23K26/352B23K2103/05B82Y30/00B05D3/102B23K26/36
Inventor 蔡玉奎刘战强罗煕淳万熠宋清华王兵唐一平
Owner SHANDONG UNIV
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