| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Preparation and Interface Structure Control of Bilayer Transparent Wear Resistant Superhydrophobic Coatings |
| ZHANG Jing1, XU Haibo1, HUANG Yue1,2, ZHOU Zhonghua1,2
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1 College of Materials, Xiamen University, Xiamen 361005, China
2 Fujian Key Laboratory of Advanced Materials, Xiamen University, Xiamen 361005, China |
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Abstract In this paper, SiO2 sol prepared with tetraethyl orthosilicate as precursor was used as a binder. SiO2 sol was spin coated on glass as the bottom bonding layer, then hydrophilic SiO2 nanoparticles were mixed with SiO2 sol and coated on the bottom as the upper layer to prepare bilayer transparent wear-resistant coatings with micro/nano hierarchical structure. Meanwhile, KH560 modified SiO2 nanoparticles were used to replace untreated SiO2 nanoparticles to prepare modified bilayer transparent wear-resistant coatings, and the effects of the coating process and the modification of SiO2 nanoparticles on the interface structure were studied. Results show that SiO2 sol bottom layer has excellent transparency and wear resistance when the spinning speed is 400 r/min and the film thickness is 1.39 μm. After 20 minutes of ultraviolet ozone irradiation, water contact angle (WCA) of SiO2 sol bottom layer is 0°, forming a hydrophilic surface with high chemical activity. The prepared bilayer and modified bilayer transparent wear-resistant coatings show superhydrophobicity, and the WCA are 151.23° and 150.82°, respectively, when modified by fluoroalkyl silane. WCA can still reach 121.97° and 126.45° after 200 cycles of mechanical abrasion under the load of 1 kg/cm2, respectively. The average surface roughness of the coatings decreases slightly after abrasion, and the roughness retentions reach 51.62% and 66.33% respectively, sho-wing excellent wear resistance. The wear resistance of micro/nano hierarchical structural coatings is closely related to voids and holes on the interface structure, and the modification of SiO2 nanoparticles can effectively reduce the voids and holes on the interface, thus improve the wear resistance.
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Published: 29 May 2020
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| Fund:This work was financially supported by the Special Fund for Key Program of Science and Technology of Fujian Province, China (2014HZ0005). |
About author:: Jing Zhang received her B.E. degrees in June 2016 from China Jiliang University. From September 2016 to June 2019, she studied for master's degree in Materials Science at Xiamen University, focusing on the research of superhydrophobic direction of automotive glass surface functionalization.
Zhonghua Zhou received his Ph.D. degree in 1998 from Mie University. He is currently a professor in College of Materials, Xiamen University and participates in the research of glass surface functionalization, environmental purification materials and applications, nanomaterials synthesis and applications. |
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2020, Vol. 34 
