Changes in Friction Properties of Monolayer Lubricant Films Induced by Development of Molecules’ Bonding |
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| Authors: | H Zhang Y Mitsuya Y Fujikawa A Fuwa Y He K Fukuzawa |
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| Affiliation: | (1) Department of Complex Systems Science, Graduate School of Information Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan;(2) Department of Micro-Nano Systems Engineering, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan;(3) Department of Electronic-Mechanical Engineering, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan |
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| Abstract: | Functional perfluoropolyether (PFPE) films consisting of mobile and bonded molecules are widely used for lubrication of magnetic
disks. In order to clarify the influence of film composition (mobile/bonded) on tribological performance, we measured the
friction properties of two types of 2 nm-thick PFPE films (functional Zdol2000 and nonfunctional Z03) under lightly loaded
(loading force: 0–1 mN) and quasi-static (low rotational speed: 2.1 mm/s) conditions as a function of elapsed time. The friction
force of Z03 remained unchanged with time and increased linearly with loading force as described by Amontons’ law. In contrast,
induced by the development of the molecules’ bonding in time, the friction force of Zdol2000 increased and transited to a
nonlinear increase with loading force as time proceeded. The nonlinear friction-load relationship of Zdol2000 in the equilibrium
state was characterized by the Johnson-Kendall-Roberts model. |
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| Keywords: | Nanotribology Boundary lubrication Friction mechanism Bonded molecule Mobile molecule Pin-on-disk friction test Magnetic disk Head-disk interface |
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