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Method for changing surface wettability of invar alloy through femtosecond laser

A technology of Invar alloy and femtosecond laser, which is applied in the field of changing the surface wettability of Invar alloy, can solve the problems that micron-level morphology cannot be processed, and it is difficult to reach the ablation threshold of Invar alloy.

Pending Publication Date: 2022-06-14
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the traditional fiber laser is used, it is difficult to reach the ablation threshold of Invar alloy in a short period of time, and it is impossible to process a controllable micron-level morphology

Method used

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  • Method for changing surface wettability of invar alloy through femtosecond laser
  • Method for changing surface wettability of invar alloy through femtosecond laser
  • Method for changing surface wettability of invar alloy through femtosecond laser

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Embodiment 1

[0046] The invar base material is cut by wire cutting, and the invar base material is polished with 240-grit water-grinding paper until the silver-white metallic luster is exposed. By setting the scanning path of the femtosecond laser as discontinuous non-moving processing, that is, single-point array arrangement, the point spacing is 160 μm, the processing power is 12 W, the number of repetitions is 1, and the single-point dwell time is 10000 μs, and micro-pits are prepared on the surface. shape (such as figure 1 ) shown. Then, the processed Invar alloy was ultrasonically cleaned for 10 minutes, and the in-situ water wetting angle was detected on its surface, and the results were as follows figure 2 shown. The cross section of the micropit is V-shaped (such as image 3 ), that is, the pits have a conical shape (such as Figure 4 ). Compare the original morphology with the wetting angle (e.g. Figure 5 It can be found that the Invar alloy is hydrophilic under this morph...

Embodiment 2

[0048] The invar base material is cut by wire cutting, and the invar base material is polished with 240-grit water-grinding paper until the silver-white metallic luster is exposed. By setting the scanning path of the femtosecond laser to continuous processing, that is, the processing path is a straight line, the line spacing is 160 μm, the processing power is 12 W, the number of scans is 1, and the scanning rate is 1000 mm / s, the microgrooves are prepared on the surface (such as Image 6 ) shown. Then, the processed Invar alloy was ultrasonically cleaned for 10 minutes, and the in-situ water wetting angle was detected on its surface, and the results were as follows Figure 7 shown. The cross-section of the microgroove is V-shaped (such as Figure 8 ), that is, the microgrooves are in the shape of inverted triangular pyramids and inverted triangular strips (such as Figure 9 ). Compare the original morphology with the wetting angle (e.g. Figure 5 ), it can be found that t...

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Abstract

The invention belongs to the field of material surface treatment, and particularly relates to a method for changing the surface wettability of invar alloy through femtosecond laser. Femtosecond laser is adopted for machining array type micro pits or machining parallel micro grooves in the surface of the 4J36 invar alloy, the cross sections of the micro pits are in a V shape, namely, the micro pits are conical, and the cross sections of the micro grooves are in a V shape, namely, the micro grooves are in an inverted triangular strip shape; the diameter of each micro pit is 40-50 microns, and the width of each micro groove is 45-55 microns. According to the method, femtosecond laser is adopted for texturing the invar alloy, the cross section of the prepared micro-pit and micro-groove structure is in a V shape, and the wettability is better; in addition, the structural sizes of the micro pits and the micro grooves prepared by femtosecond laser are micron-scale and nano-scale, so that the wettability of the invar alloy is further optimized.

Description

technical field [0001] The invention belongs to the field of material surface treatment, in particular to a method for changing the surface wettability of an Invar alloy by femtosecond laser. Background technique [0002] 4J36 Invar is an iron-based alloy because of its thermally stable face-centered cubic structure, which makes its thermal expansion coefficient almost constant with temperature. Among them, the Invar alloy with the grade of 4J36 contains Ni35.4%. The most notable feature of 4J36Invar alloy is the lowest coefficient of thermal expansion (0.5~2.5 / ℃). elongation, etc. In addition, the linear expansion coefficient of Invar alloy is very stable, and it will not be easily corroded. It is a very suitable new structural material in precision instruments and equipment, and is widely used in the aerospace field. [0003] However, due to the low temperature environment in which aerospace vehicles work, there is a problem of low temperature freezing caused by water a...

Claims

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Application Information

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IPC IPC(8): B23K26/354B23K26/60
CPCB23K26/354B23K26/60
Inventor 李晓鹏蒋晗刘乙生彭勇王克鸿王大森
Owner NANJING UNIV OF SCI & TECH
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