Surface modification of ceramic coating for enhanced hydrophobicity and wear properties

Abstract

In this paper, a micro-nano structural ceramic coating with good hydrophobicity and wear resistance was successfully prepared by sol-gel method, which is assisted by pore-forming agent and nanoparticles 1H, 1H, 2H, 2Hperfluorodecyltriethoxysilane modified. The surface morphology, hardness, roughness, wettability, and tribological properties of three different surface coatings were characterized. With the complication of the surface structure, the roughness of the coating increases from 1.30 to 2.05 μm. Under the combined effect of roughness and long hydrophobic chains, the contact angles of the coatings before and after modification under saline conditions increased from 56.31 to 140.59 • (pH4); from 55.58 to 134.40 • (pH7); from 53.80 to 132.26 • (pH10). Through the comparison of wear rate and wear morphology, it is found that the micro-nano structure coating has the lowest wear rate (0.705 × 10 -6 mm 3 ⋅N -1 ⋅s -1 ) and the smallest plastic deformation. This means that in addition to the good hydrophobicity and chemical stability, the micro-nano structure on the surface also improves the wear resistance of the coating.