The diffusion coefficient has been used to estimate the mobility of PFPE lubricant on hard disk media. In former researches, initial lubricant thickness distribution is assumed to be step function. And similar solution was used to estimate the diffusion coefficient. But based on our experimentally measured data, initial distribution is not step function but has inclined slope. It leads the over estimation of the diffusion coefficient especially for low mobility lubricants. In this paper, instead of assuming initial distribution is step function and using similar solution, the diffusion coefficient is estimated by the method combining the experimentally measured results and the numerical solutions. The estimated diffusion coefficient is much lower for the low mobility lubricants. Calculated thickness distribution agrees well with the experimentally measured distribution. The mobility and spreading characteristics of PFPE lubricants can be estimated precisely using this method.
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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
Precise Estimation of Mobility of PFPE Lubricants Combining the Experimental Method and Numerical Method Available to Purchase
Mineo Oka,
Mineo Oka
Fuji Electric Corporate R&D, Ltd., Tsukama, Matsumoto, Japan
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Shinichi Nakazawa
Shinichi Nakazawa
Fuji Electric Storage Device, Ltd., Tsukama, Matsumoto, Japan
Search for other works by this author on:
Mineo Oka
Fuji Electric Corporate R&D, Ltd., Tsukama, Matsumoto, Japan
Shinichi Nakazawa
Fuji Electric Storage Device, Ltd., Tsukama, Matsumoto, Japan
Paper No:
2002-TRIB-0259, pp. 69-75; 7 pages
Published Online:
February 4, 2009
Citation
Oka, M, & Nakazawa, S. "Precise Estimation of Mobility of PFPE Lubricants Combining the Experimental Method and Numerical Method." 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. 69-75. ASME. https://doi.org/10.1115/2002-TRIB-0259
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