Fabrication and Properties of Super-hydrophobic Composite Coatings

doi:10.11901/1005.3093.2017.391

Chinese Journal of Materials Research

2018, Vol. 32

Issue (7): 502-512 DOI: 10.11901/1005.3093.2017.391

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Fabrication and Properties of Super-hydrophobic Composite Coatings

Shuohong GAO^1,², Min LIU²(

), Xiaojun PANG², Xiaofeng ZHANG², Changguang DENG², Xinghua LIANG², Chunming DENG²

1 School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China
2 Guangdong Institute of New Materials, National Engineering Laboratory for Modern Materials Surface Engineering Technology, Key Lab of Gunagdong for Modern Surface Engineering Technology, Guangzhou 510651, China

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Shuohong GAO, Min LIU, Xiaojun PANG, Xiaofeng ZHANG, Changguang DENG, Xinghua LIANG, Chunming DENG. Fabrication and Properties of Super-hydrophobic Composite Coatings. Chinese Journal of Materials Research, 2018, 32(7): 502-512.

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Abstract

Composite coatings of double-layered Al₂O₃/PTFE and single-layered Al₂O₃-PTFE were prepared via atmospheric plasma spraying (APS) process. The morphology, phase composition, roughness, hardness, hydrophobic property and wear resistance of the composite coatings were characterized by scanning electron microscope (SEM), 3D topography tester, micro-hardness tester, contact angle tester and friction and wear tester respectively. The influence of Al₂O₃ bond coat, Al₂O₃ hard particle filling and different process parameters on the hydrophobic property and wear resistance of the composite coatings were assessed. Results show that the wear resistance of the single PTFE coating were improved significantly by inducing Al₂O₃ ceramic as a bond coat or as hard particle filling phase into the composite coatings; The wear resistance property of Al₂O₃-PTFE composite coatings was superior to that of the Al₂O₃/PTFE composite coatings, correspondingly the wear rate of which was 2.84×10^-5 mm³/N·m and 9.97×10^-5 mm³/N·m respectively, the friction coefficient is 0.51 and 0.38 respectively; While the surface of the two composite coatings showed good hydrophobic properties with static contact angle of 155.4° and 148.9° respectively, which may be attributed to the compacted micro-nano convex structure on the rough surface and the synergistic effect of fluoride with low surface energy distributed on the composite coating surface. After the friction and wear test, the surface structure of the two composite coatings was damaged, hence the hydrophobicity of the coatings degraded, even so, the Al₂O₃/PTFE composite coating still exhibits super-hydrophobicity.

Key words: composites superhydrophobic composite coatings atmospheric plasma spraying hydrophobic property wear-resistance

Received: 03 July 2017

ZTFLH:

TG147

Fund: Supported by National Key R & D Plan (No. 2017YFB0306100), Guangdong Academy of Sciences (No. 2017GDASCX-0202);Guangdong Technical Research Program (Nos. 201313050800031, 201413050502008, 2014B070706026 & 2013B061800053);Guangdong Natural Science Foundation (No. 2016A030312015)

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	Shuohong GAO
	Min LIU
	Xiaojun PANG
	Xiaofeng ZHANG
	Changguang DENG
	Xinghua LIANG
	Chunming DENG

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https://www.cjmr.org/EN/10.11901/1005.3093.2017.391 OR https://www.cjmr.org/EN/Y2018/V32/I7/502

Table 1 Spraying process parameters of Al₂O₃/PTFE coatings

Fig.1 Schematic diagram of plasma spraying

Table 2 Spraying process parameters of Al₂O₃-PTFE coatings

Fig.2 Schematic diagram of pin-on-disk wear test apprature

Fig.3 Surface morphology of the Al₂O₃/PTFE and Al₂O₃-PTFE composition coatings

Fig.4 Surface morphology of coated particles (a) Al₂O₃/PTFE composite coatings; (b) Al₂O₃-PTFE composite coatings

Fig.5 Cross section morphology of the Al₂O₃/PTFE and Al₂O₃-PTFE composition coatings (a) (b) Al₂O₃/PTFE composite coatings; (c) (d) Al₂O₃-PTFE composite coatings

Table 3 Mechanical properties of coatings

Fig.6 3D surface images of the Al₂O₃/PTFE and Al₂O₃-PTFE composite coatings (a) Al₂O₃/PTFE composite coatings; (b) Al₂O₃-PTFE composite coatings

Fig.7 The surface elemental maps of the Al₂O₃/PTFE composite coatings

Fig.8 The surface elemental maps of the Al₂O₃/PTFE composite coatings

Fig.9 Element analysis of Spot 1 in Al₂O₃-PTFE composite coatings surface

Fig.10 Schematic of super-hydrophobic surface formed from micro-nano structures

Fig.11 Contact angle of the Al₂O₃/PTFE and Al₂O₃-PTFE composite coatings (a) (b) Al₂O₃/PTFE composite coatings; (c) (d) Al₂O₃-PTFE composite coatings

Fig.12 Friction curves of the Al₂O₃/PTFE and Al₂O₃-PTFE composite coatings (a) Al₂O₃/PTFE composite coatings; (b) Al₂O₃-PTFE composite coatings

Fig.13 Morphologies of wear tracks on Al₂O₃/PTFE and Al₂O₃-PTFE composite coatings surface (a) Al₂O₃/PTFE composite coatings; (b) Al₂O₃-PTFE composite coatings

Table 4 Friction and wear results of the composite coatings

Fig.14 Contact angle of the Al₂O₃/PTFE and Al₂O₃-PTFE composite coatings after frictional wear (a) (b) Al₂O₃/PTFE composite coatings; (c) (d) Al₂O₃-PTFE composite coatings

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