Preparation and Characterization of Super-Hydrophobicity Silica Coating by HVOF

Wednesday, May 13, 2015
Exhibit Halls A&B (Long Beach Convention and Entertainment Center)
Dr. Jie Li , State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China
Prof. Cheng-Xin Li , State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China
Ms. Yu Zhang , State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China
Prof. Xi-De Pan , State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China
Prof. Guan-Jun Yang , State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China
Xiao-Tao Luo , State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China
Prof. Chang-Jiu Li , State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China
A new method to fabricate micro-nano scale surface applied to super-hydrophobicity surface is introduced in the present paper. Silica coatings with micro-nano hierarchical structure were deposited using micrometer-sized silica (SiO2) particles on the stainless steel substrates by high-velocity oxyfuel (HVOF) spraying. The SiO2 coating was modified by heptadecafluorodecyl trimethoxysilane (FAS) to reduce the surface energy. The influences of the HVOF process parameters on the wettability of the coatings were investigated. The coatings were characterized by scanning electron microscopy (SEM), 3D laser microscopy (LSM), and fourier transform infrared spectrometer (FTIR). The results show that the as-sprayed coatings exhibit the surfaces with micro-nano hierarchical structure. The water droplets are strongly adhesive to the as-sprayed surface, while by FAS absorbing treatment, the surfaces exhibit super-hydrophobicity, whose contact angle are as high as 150°, and the water droplets tend to roll on the surface with extremely low adhesion with a sliding angle of 3°.
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