Browse Prior Art Database

Process to Chemically Bond Perflouropolyether Lubricants to Thin-Film Magnetic Recording Disks

IP.com Disclosure Number: IPCOM000105585D
Original Publication Date: 1993-Aug-01
Included in the Prior Art Database: 2005-Mar-20
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Crowder, MS: AUTHOR [+2]

Abstract

This disclosure demonstrates, for the first time, that a perfluoropolyether lubricant can be chemically bonded to a thin film magnetic recording disk (TFD) by applying the lubricant in vacuum. Unlike other lubrication processes, in this disclosed method, the TFD need not be heated during the deposition, nor does the lubricant need a chemically reactive group to achieve bonding to the disk.

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Process to Chemically Bond Perflouropolyether Lubricants to Thin-Film Magnetic Recording Disks

      This disclosure demonstrates, for the first time, that a
perfluoropolyether lubricant can be chemically bonded to a thin film
magnetic recording disk (TFD) by applying the lubricant in vacuum.
Unlike other lubrication processes, in this disclosed method, the TFD
need not be heated during the deposition, nor does the lubricant need
a chemically reactive group to achieve bonding to the disk.

      A carbon overcoated thin-film magnetic recording disk is placed
in a vacuum chamber (10 sup  8  Torr) and a perfluropolyether
lubricant (Demnum S-65) is applied by heating a reservoir containing
Demnum S-65 to 150ºC and admitting the vapor to the high vacuum
chamber.  Analysis of the TFD shows the presence of a monolayer of
the lubricant on the disk surface.  The lubricant layers thus applied
is unextractable with either boiling freon, or boiling
trifluoroethanol indicating that it is chemically bonded to the
surface by illuminating the disk with UV light (wavelength <254 nm)
during deposition.  (The thickness being limited by the mean free
path of photoelectrons created at the surface by the UV light.)
Again, the film applied via the UV assisted deposition of Demnum S-65
are unextractable with boiling freon/trifluoroethanol.

      The lubricating films applied by the methods described here are
chemically stable and provide for excellent tribological performance
i...