Tribological behavior of polyurethane-based composite coating reinforced with TiO2 nanotubes |
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| Authors: | Hao-Jie Song Zhao-Zhu Zhang Xue-Hu Men |
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| Institution: | a State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China
b Graduate School, Chinese Academy of Sciences, Beijing 100039, PR China |
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| Abstract: | The unmodified and hexamethylene diisocyanate (HDI) modified TiO2 nanotubes, were used for fabricating TiO2 nanotubes (TiNTs)/polyurethane (PU) composite coating. The effects of applied load and sliding speed on the tribological behavior of the composite coating were investigated using a block-on-ring wear tester. Compared to the TiO2 nanotubes filled PU composite coating, the HDI modified TiO2 nanotubes (TiNTs-HDI) filled one had the lower friction coefficient and higher wear life under various applied loads and sliding speed. Scanning electron microscope (SEM) investigation showed that the TiNTs-HDI filled PU coating had smooth worn surface under given applied load and sliding speed, and a continuous and uniform transfer film formed on the surface of the counterpart ring, which helped to reduce the wear of the coating. The improvement in the tribological properties of TiNTs-HDI/PU composite coating might due to an improvement in interfacial adhesion between TiNTs and PU after HDI treatment. The strong interfacial coupling of the composite coating made TiNTs-HDI not easy to detach from the PU matrix, and prevented the rubbing-off of PU composite coating, accordingly improved the friction and wear properties of the composite coating. |
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| Keywords: | TiO2 nanotubes Polyurethane coating Tribological behavior Transfer films |
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