2009 年 60 巻 4 号 p. 280
Using atomic force microscopy (AFM), nanoindentation, nanowear, and viscoelastic testing were performed to elucidate nanomechanical properties of lubricant-coated magnetic disks. The surface deformation resistance of an ultraviolet (UV)-irradiated disk is superior to those of heat-treated or untreated disks. Evaluation of viscoelastic change using nanowear tests revealed that, for the UV-irradiated and untreated magnetic disks, tanδ does not decrease with friction. However, for the heat-treated disk, tanδ decreases with sliding. This result demonstrates the resupply capability of the UV-irradiated and untreated lubricant-coated disks during sliding. The lubricant-coated magnetic disks’ friction properties are evaluated using the ball-on disk friction test. The UV-irradiated magnetic disk exhibits stable friction coefficients, and less friction damage than the other. These superior properties of the UV-irradiated magnetic disk can be understood in terms of nanomechanical properties evaluated using AFM. The UV-irradiated disk has suitable bonding strength between the lubricant and DLC, in addition to the resupply capability of the free lubricant.