Preparation and Properties of New Ceramic Composite Superhydrophobic Coatings
GAO Shuohong1,2, LIU Min1,2, ZHANG Xiaofeng2, DENG Chunming2
1 School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006; 2 The Key Laboratory of Guangdong for Modern Surface Engineering Technology, National Engineering Laboratory for Modern Materials Surface Engineering Technology, Guangdong Institute of New Materials, Guangzhou 510650;
Abstract: In order to develop a novel method for preparing superhydrophobic coatings and improve the structure and properties of them, using Al2O3-40%TiO2(AT40) and PFA (polyfluoroalkoxy) powders as raw materials. Two different PFA/AT40 composite superhydrophobic coatings were prepared on the aluminum alloy substrate by atmospheric plasma spraying (APS) under diffe-rent current and argon flow rate. The phase composition, microstructure, friction coefficient and basic properties of them were cha-racterized. The results showed that the phase compositions are C20F42, Al2TiO5 and a small amount of γ-Al2O3, α-Al2O3 phase. The surface structure is composed of circular and oval granular structure, and micro-nano mastoid structure was found, which similar to the lotus leaf. The roughness is 9.3 μm and 12.41 μm. Both of them show comprehensive performance, and the static contact angle with water is above 150°, the rolling angle is 4—5°. Besides, the results indicated that current and argon are impact on the perfor-mance of coatings. In the case of other parameters unchanged, with the increase of current and the decrease of argon flow rate, the content of ceramic phase in the coating increases, it leads to roughness, friction coefficient, micro-hardness and adhesive strength increase.
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2018, Vol. 32 
