Effect of Aging on Hydrophobic and Anti-icing Properties of PTFE/PPS Composite Coatings

被引：0
|
作者：
Guo Y.-Y. [1 ,2 ]
Wang L.-T. [1 ,2 ]
Zhu L.-N. [1 ,2 ]
Yue W. [1 ,2 ]
Kang J.-J. [1 ,2 ]
Ma G.-Z. [3 ]
机构：
[1] School of Engineering Technology, China University of Geosciences, Beijing
[2] Zhengzhou Research Institute, China University of Geosciences, Zhengzhou
[3] National Key Laboratory for Remanufacturing, Army Academy of Armored Forces, Beijing
来源：
Surface Technology | 2023年 / 52卷 / 11期
基金：
中国国家自然科学基金;
关键词：
anti-icing performance; high temperature thermal aging; hydrophobicity; PTFE/PPS composite coating; solar radiation light aging;
D O I：
10.16490/j.cnki.issn.1001-3660.2023.11.006
中图分类号：
学科分类号：
摘要：
The PTFE/PPS composite coating applied to the surface of aircraft can greatly improve the icing phenomenon on the surface of aircraft. However, the aircraft surface coating is subject to high temperature and solar radiation during service, which is easy to cause the damage of microstructure and lose the original performance. Therefore, the effect of aging on the hydrophobic and anti-icing properties of PTFE/PPS composite coatings was investigated. Aircraft engine fan blade material titanium alloy Ti-6Al-4V (TC4) raw material was selected, and the TC4 matrix was processed into a 25 mm×25 mm×3 mm bulk sample by electric discharge wire cutting, and the TC4 matrix was subject to thermal treatment. Quartz sand with particle size of 250~800 μm was selected for sand blasting. According to the PTFE: PPS ratio of 45:55, PPS powder particles were added to the PTFE emulsion to obtain a 45% PTFE/PPS coating. The prepared mixed paint was fully mixed into the ANEST IWATA W-71 spray gun, the spray gun pressure was adjusted to 0.3 MPa, and the distance between the muzzle and the workpiece was 20 cm, so that the spray angle was maintained at 45°. After drying at 100 ℃ for 10 min, the sprayed composite coating was placed in a box curing furnace for curing treatment, gradually heated to 370 ℃ within 45 min, and then sintered at constant temperature for 20 min. After cooling in the air, a 45%PTFE/PPS composite coating was obtained. The morphology was characterized with a scanning electron microscopy (SEM) (MERLIN Compact, ZEISS). The 3D morphology of the original coating was measured and the surface roughness was calculated with a laser confocal microscope (Olympus OLS4100). A Fourier infrared spectroscopy (FT-IR) (PerkinElmer) was used to analyze the chemical composition and functional groups of the PTFE/PPS composite coating under different service conditions. The composition and chemical morphology of the elements were analyzed with an X-ray photoelectron spectroscopy (XPS) (Thermo SCIENTIFIC ESCALAB 250Xi). After thermal aging (24, 48, 96 h) and solar radiation optical aging (24, 48, 96 h) experiments, the hydrophobic and anti-icing properties of the PTFE/PPS composite coating were tested. PTFE/PPS composite coating was prepared on a TC4 substrate by one step spraying method. The surface roughness of the original PTFE/PPS composite coating and the PTFE/PPS composite coating after 24 h, 48 h and 72 h of thermal aging was 8.075 μm, 5.383 μm, 4.583 μm and 5.466 μm, respectively. The static water contact angle was reduced from 139.70° to 132.36°, 131.13° and 130.36°, and the icing time was shortened from the initial 346 s to 326 s, 309 s and 294 s. The adhesion of ice crystals increased from the initial 8.65 N to 8.90 N, 9.15 N, 9.65 N. After 24 h, 48 h and 72 h of solar radiation aging, the surface roughness of the PTFE/PPS composite coating was 10.549 μm, 10.974 μm and 9.969 μm, respectively, and the static water contact angle decreased from 139.70° to 135.83°, 133.85° and 129.97°. The icing time was shortened from the initial 346 s to 317 s, 269 s and 242 s. The adhesion of ice crystals increased from the initial 8.65 N to 9.05 N, 9.15 N, 9.40 N. Although thermal aging and photoaging will reduce the hydrophobic and anti-icing properties of PTFE/PPS composite coatings, it can still maintain good hydrophobic and anti-icing properties compared with the matrix. © 2023 Chongqing Wujiu Periodicals Press. All rights reserved.
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页码：72 / 83
页数：11
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