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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