[Untitled]
In: Tribology Letters, Jg. 12 (2002), S. 163-169
Online
unknown
Zugriff:
The dewetting of perfluoropolyether (PFPE) films on amorphous nitrogenated carbon, CNx, is investigated. An optical surface analyzer is used to image perfluoropolyether films on CNx-overcoated magnetic recording disks. An autophobic dewetting transition is observed to result when the PFPE film thickness applied to the disk surface exceeds a critical value. This critical dewetting thickness is linearly dependent on the PFPE molecular weight. Addition of the phosphazine, X-1P, to the PFPE film reduces the critical dewetting thickness compared to that of the neat lubricant. Dewetting in these molecularly-thin PFPE lubricant films is shown to occur at thicknesses where the total disjoining pressure is negative. The impact of this autophobic dewetting on the performance of a head--disk interface is inferred from take-off height measurements conducted as a function of PFPE film thickness. A steep reduction in the slider--disk clearance is observed when the PFPE film is present at thicknesses in excess of the critical dewetting thickness.
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[Untitled]
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Autor/in / Beteiligte Person: | Tyndall, G.W. ; Waltman, Robert J. ; Khurshudov, Andrei |
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Zeitschrift: | Tribology Letters, Jg. 12 (2002), S. 163-169 |
Veröffentlichung: | Springer Science and Business Media LLC, 2002 |
Medientyp: | unknown |
ISSN: | 1023-8883 (print) |
DOI: | 10.1023/a:1014707207255 |
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