Session: 10-01 Tribology, Dynamics and Servo control of Nano-Micro systems

Paper Number: 109769

109769 - Adsorption and Tribological Properties of Perfluoropolyether Lubricant Films Having Main-Chains With Different Carbon Number 

In order to maintain a head-disk clearance at sub-nanometer levels, the thickness of lubricant films on magnetic disks should be reduced. For this purpose, multidentate-type lubricants have been developed, in which the lubricant molecules are in a planner orientation with the hydroxyl group in the center of the lubricant’s main chain. Additionally, the orientation of lubricant molecules on magnetic disks depends on the structure of the main chain or the carbon number of the main chain. In this study, perfluoropolyether lubricants with different carbon numbers in the main chain were prepared. The effect of varying the carbon numbers on the lubricant-molecule adsorption and tribological properties was investigated. Among all lubricants, the lubricants with two carbon numbers in main-chain segments and multidentate type of main-chain showed the lowest monolayer thickness, widest clearance, and smallest slider wear. The results of this study indicate that the PFPE lubricant with C2 and a multidentate type of main chain exhibited the lowest monolayer thickness among, the widest head-media clearance, and the least amount of slider wear among all lubricants.

Presenting Author: Hiroshi Tani Kansai University, Mechanical Engineering Dept.

Presenting Author Biography: He had worked as an engineer of head disk interface of magnetic disks for Hitachi and HGST from 1986 to 2008.
He moved to Kansai University at 2008, then he have studied about head-disk interface tribology and nanotribology.