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Browse Prior Art Database

Vapor Deposition of Lubricant for Disk Files

IP.com Disclosure Number: IPCOM000109461D
Original Publication Date: 1992-Aug-01
Included in the Prior Art Database: 2005-Mar-24
Document File: 1 page(s) / 56K

Publishing Venue

IBM

Related People

Chainer, TJ: AUTHOR [+3]

Abstract

Disk file failures are attributed to depletion in lubricant film thickness or deterioration of lubricant films during disk file operation. A method is described here for vapor deposition of lubricant films of order 100 Angstroms during disk manufacture and for replenishing such films on operating disk in situ.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 83% of the total text.

Vapor Deposition of Lubricant for Disk Files

      Disk file failures are attributed to depletion in lubricant
film thickness or deterioration of lubricant films during disk file
operation.  A method is described here for vapor deposition of
lubricant films of order 100 Angstroms during disk manufacture and
for replenishing such films on operating disk in situ.

      The magnetic disk for coating with lubricant is placed in a
container, e.g., a bell jar, with a heated source of lubricant which
evaporates and deposits in to the disk.  The film deposition rate
depends on the disk surface temperature and transport properties of
the lubricant molecules from the source.  Inert atmosphere transport
is controlled by diffusion and convection.  Vacuum transport is
diffusion limited only and thus has higher deposition rates.
Deposition rates of 0.5 Angstroms/min. to 20 Angstroms/min. are
achieved by the described method.  Implementation of the technique is
not limited to a heated lubricant source.  The same effect is
achieved by blowing hot gas over a source or through a sponge which
is saturated with lubricant.

      In situ maintenance of disk files is accomplished by the
described vapor deposition technique by means of hardware additions
to the disk file schematically shown in the figure.  Periodically the
cooling air inlet is closed and the file is flushed with a carrier
gas, e.g., nitrogen, which is recirculated over a heated lubricant
source raising the par...