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Super-hydrophobic anti-icing aviation aluminum alloy surface and production method

An aluminum alloy surface, anti-icing technology, applied in the direction of the fuselage bulkhead, etc., can solve the problems of difficult to achieve ice shedding, surface ice adhesion performance reports, and super-hydrophobic surface ice adhesion.

Pending Publication Date: 2020-10-30
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN107723773A discloses an aluminum alloy bionic superhydrophobic anti-icing surface, which has hydrophobicity after the freezing-melting process, but does not report on the ice adhesion performance of the surface
[0004] From the above research status, although there have been patents and literature reports on superhydrophobic surfaces of aluminum alloys, the reported superhydrophobic surfaces of aluminum alloys rarely involve ice adhesion, and the ice adhesion of reported superhydrophobic surfaces is still relatively low. High, it is difficult to achieve the effect of ice falling off by itself

Method used

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  • Super-hydrophobic anti-icing aviation aluminum alloy surface and production method
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  • Super-hydrophobic anti-icing aviation aluminum alloy surface and production method

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Embodiment 1-1

[0044] The invention discloses a micro-nano structure on the surface of a super-hydrophobic anti-icing aviation aluminum alloy with ultra-low ice adhesion. figure 1 As shown in the figure, it can be seen that the surface is composed of periodically distributed complex micro-nano tertiary structures. Among them, the nanostructure is a two-dimensional nanosheet structure, which is densely grown on the surface of the three-dimensional microcone; the submicron spherical structure is grown by stacking nanosheets. The diameter is about 500nm, dispersed on the microcone, and the whole three-dimensional three-level complex micro-nano structure has the structural characteristics of integrated interconnection. After surface chemical modification, the surface can exhibit a water droplet contact angle of about 160°, such as figure 2 shown. The ice adhesion strength of this surface is only 6kPa, compared with the untreated aluminum alloy surface (240kPa), the ice adhesion strength is red...

Embodiment 2-1

[0053] 1) Using aviation aluminum alloy foil as the base material, first use a mechanical cutting knife to obtain a sheet-shaped aluminum alloy foil sample with an area of ​​20mm×80mm, and then place it in absolute ethanol and acetone for ultrasonic cleaning for 10-20 minutes, After removal, dry them in a gentle stream of nitrogen gas.

[0054] 2) Perform periodic patterned ablation on the surface of the aluminum alloy sample using a high-power ultrafast laser. The laser wavelength is 1030nm, the pulse width is 800fs, the pulse repetition frequency is 200kHz, and the laser power is 6W. Processing, the distance between adjacent scanning lines is 40 μm, the scanning speed is 500 mm / s, and the height of the three-dimensional microcone unit is 60 μm, the diameter of the bottom is about 40 μm, and the period is 40 μm. After the ablation is completed, the sample is ultrasonically cleaned in absolute ethanol After 10 minutes, take it out and dry it in a gentle nitrogen stream.

[00...

Embodiment 2-2

[0060] 1) Using aviation aluminum alloy foil as the base material, first use a mechanical cutting knife to obtain a sheet-shaped aluminum alloy foil sample with an area of ​​20mm×80mm, and then place it in absolute ethanol and acetone for ultrasonic cleaning for 10-20 minutes, After removal, dry them in a gentle stream of nitrogen gas.

[0061] 2) Perform periodic patterned ablation on the surface of the aluminum alloy sample using a high-power ultrafast laser. The laser wavelength is 1030nm, the pulse width is 800fs, the pulse repetition frequency is 200kHz, and the laser power is 6W. Processing, the distance between adjacent scanning lines is 40 μm, the scanning speed is 500 mm / s, and the height of the three-dimensional microcone unit is 60 μm, the diameter of the bottom is about 40 μm, and the period is 40 μm. After the ablation is completed, the sample is ultrasonically cleaned in absolute ethanol After 10 minutes, take it out and dry it in a gentle nitrogen stream.

[00...

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Abstract

A super-hydrophobic anti-icing aviation aluminum alloy surface with ultralow ice adhesion is composed of a multi-stage micro-nano structure, the micro-nano structure is based on a three-dimensional micron cone structure periodically distributed on the surface of an aluminum alloy base material, and densely-growing nanosheets and nano flower clusters composed of the nanosheets are distributed on the surface of a micron cone; and one or two of submicron spheres and submicron flowers are dispersed and distributed on the surface of the micron cone or between the micron cones. The invention furtherdiscloses a production method of the surface, the surface is formed by combining ultrafast laser ablation and a wet chemical method and then carrying out low-free-energy surface chemical modification, and large-area efficient production can be achieved. The aviation aluminum alloy anti-icing surface has extremely low ice adhesion, adhesion strength between ice and the surface can be as low as 6 kPa, and the ice can automatically fall off under the action of self gravity or slight vibration. The surface structure can be widely applied to anti-icing fields of aviation key components, ships, ground transportation tools, refrigerators, air conditioners and the like.

Description

technical field [0001] The invention relates to the field of aviation functional materials, in particular to a superhydrophobic anti-icing aviation aluminum alloy surface and a preparation method thereof. Background technique [0002] Icing on the surface of aircraft wings and some key parts at high altitude will lead to dangerous airflow conditions, increase drag, and even seriously affect the stability and safety of aircraft, resulting in flight accidents. At present, the methods of deicing the aircraft surface mainly include traditional deicing methods such as hot gas deicing, electric heating deicing and mechanical deicing. The energy consumption restricts the improvement of the overall performance of the aircraft, and will also cause damage to the wing surface and accelerate the aging of equipment. In recent years, new anti-icing technology and anti-icing surfaces have become the focus of development at home and abroad. Among them, super-hydrophobic micro-nano structur...

Claims

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Application Information

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IPC IPC(8): B64C1/12
CPCB64C1/12
Inventor 钟敏霖张红军潘瑞
Owner TSINGHUA UNIV
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