In this work, tribological characteristics of anodic aluminum oxide (AAO) were investigated. For understanding effects of shape of nano-structure on AAO surface, 3types of AAO was produced and conducted frictional tests of 100 and 5000 cycles with 5mN load. Also, perfluoropolyether (PFPE) coating was applied to enhance durability. In case of 100 cycles of friction test, it was confirmed that PFPE coating could reduce friction coefficient. Also, it was revealed that bonding energy between PFPE and AAO is not that strong and nano-structure is strongly related with tribological characteristics by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS).
Moreover, porous anodic aluminum oxide with 3 different pore sizes was prepared to observe effect of pore size of tribological performances. Also, silver and PFPE coating was applied to obtain enhanced durability. To measure tribological characteristics, tribotests were conducted for 100, 5000 and 40000 cycles with 5mN and 15mN load. Wear track of surface was observed with confocal microscope, SEM and EDS. Through the experiments, it was revealed that porous anodic aluminum oxide in range of 100~200nm pore size, larger pore size showed better durability and lower friction coefficient. Wear tracks of the surface were observed using laser confocal microscope, SEM and EDS. EDS data showed that silver remains on the wear track except small type substrate after 40000 cycles of friction test. Both PFPE and silver coating were effective for enhancing durability. But in case of porous aluminum oxide, PFPE coating showed different result from previous experiment, that increasing friction coefficient. Therefore, more experiments necessary for understanding PFPE coating.