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Chemically Crosslinked Fluorocarbon Films for Thin Film Disk Lubrication

IP.com Disclosure Number: IPCOM000117515D
Original Publication Date: 1996-Mar-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 2 page(s) / 52K

Publishing Venue

IBM

Related People

Baum, TH: AUTHOR [+4]

Abstract

The surface of thin film magnetic recording disks is currently protected against wear resulting from contact of the head with the disk by overcoating the magnetic layer with a hard carbon overcoat, and then lubricating the overcoat with a liquid (perfluoropolyether) lubricant. A fundamental limitation of using liquids at the Head-Disk Interface (HDI) is, however, the tendency of the head to stick to very smooth disk surfaces as a result of meniscus formation. This sticking (stiction) can be overcome by the use of a solid fluorocarbon lubricant as described in (*). The tribological performance of the solid fluorocarbon lubricant is critically dependent on the chemical structure. In particular, increasing the crosslink density improves tribological performance.

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Chemically Crosslinked Fluorocarbon Films for Thin Film Disk Lubrication

      The surface of thin film magnetic recording disks is currently
protected against wear resulting from contact of the head with the
disk by overcoating the magnetic layer with a hard carbon overcoat,
and then lubricating the overcoat with a liquid (perfluoropolyether)
lubricant.  A fundamental limitation of using liquids at the
Head-Disk Interface (HDI) is, however, the tendency of the head to
stick to very  smooth disk surfaces as a result of meniscus
formation.  This sticking  (stiction) can be overcome by the use of a
solid fluorocarbon lubricant  as described in (*).  The tribological
performance of the solid fluorocarbon lubricant is critically
dependent on the chemical structure.  In particular, increasing the
crosslink density improves tribological performance.  In the
reference, the crosslink density is controlled by adjusting the ratio
of ions to polymerizable species reaching the surface, and the energy
and chemical identity of the ions.  In the current work, it has been
demonstrated that the solid lubricant structure  can be controlled
chemically by introduction of a crosslinking agent during the
deposition of the fluorocarbon film.  By controlling the
concentration of the crosslinking agent relative to the fluorocarbon
precursor, control over the degree of crosslinking, and hence the
tribological properties of the film, can be realized.

      The fluorocarbon films a...