An unstable phenomenon arising at the boundary between PFPE solution dipped and un-dipped zones over DLC coated magnetic disks has been studied. The formation conditions of a ridge of lubricant, or “sierra,” at this boundary and the structure of the “sierra” were clarified. Lubricant film having a step-shaped boundary was first formed by the halfway dip-coating method, and film thickness distribution was then measured around the boundary area. It was found that the film thickness was uniform over the entire lubricated area for a higher speed of withdrawing the disk from the lubricant solution and decreased linearly when the withdrawing speed was lowered. However, the “sierra” structure of the lubricant suddenly formed along the boundary line when the withdrawing speed was further decreased to less than a specified value of around 1 mm/s. The “sierra” was less likely to form for a lower dilution and a longer elapsed time after making the lubricant solution. It was also revealed that, along the ridgeline of the “sierra,” peaks formed periodically and the peak feet propagated in the direction perpendicular to the boundary, forming convex fronts and leaving multiplex bead chains of lubricant accumulations inside the convex.
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ASME/STLE 2002 International Joint Tribology Conference
October 27–30, 2002
Cancun, Mexico
Conference Sponsors:
- Tribology Division
ISBN:
0-7918-3660-6
PROCEEDINGS PAPER
Formation of Lubricant “Sierra” at Boundary Between PFPE Solution Dipped and Un-Dipped Zones Over DLC Coated Magnetic Disks
Yasunaga Mitsuya,
Yasunaga Mitsuya
Nagoya University, Nagoya, Japan
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Yoshihiro Hayashi
Yoshihiro Hayashi
Nagoya University, Nagoya, Japan
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Yasunaga Mitsuya
Nagoya University, Nagoya, Japan
Keiko Goto
Nagoya University, Nagoya, Japan
Yoshihiro Hayashi
Nagoya University, Nagoya, Japan
Paper No:
2002-TRIB-0252, pp. 27-32; 6 pages
Published Online:
February 4, 2009
Citation
Mitsuya, Y, Goto, K, & Hayashi, Y. "Formation of Lubricant “Sierra” at Boundary Between PFPE Solution Dipped and Un-Dipped Zones Over DLC Coated Magnetic Disks." Proceedings of the ASME/STLE 2002 International Joint Tribology Conference. Magnetic Storage Symposium: Frontiers of Magnetic Hard Disk Drive Tribology and Technology. Cancun, Mexico. October 27–30, 2002. pp. 27-32. ASME. https://doi.org/10.1115/2002-TRIB-0252
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