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Advanced Hydrocarbon Lubricants for Thin Film Disks

IP.com Disclosure Number: IPCOM000116807D
Original Publication Date: 1995-Nov-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 2 page(s) / 36K

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Related People

Gregory, TA: AUTHOR [+4]


A process which solves the problem of stiction in thin film disks is described.

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This is the abbreviated version, containing approximately 93% of the total text.

Advanced Hydrocarbon Lubricants for Thin Film Disks

      A process which solves the problem of stiction in thin film
disks is described.

      Mechanical performance in thin film disks falls in two major
areas, stiction and durability.  Stiction because of too much lube
needed to satisfy the durability criteria and stiction because of
water response at high humidity kills many designs and has caused
major file problems in production files.  Many times durability is
traded off just to reduce stiction exposures.  As disks have become
smoother for magnetic reasons, the problem has become even larger.
New disks designs benefit from textures at < 50 angstroms Rq but the
standard fluorocarbon lubes do not provide good stiction and
durability in this arena.

      The problems have been solved of stiction at low texture
roughness < 50 angstroms Rq (humidity response and too much lube to
satisfy durability requirements) by using new hydrocarbon lubes which
make the disks surface hydrophobic, and do not require so much
thickness for durability that stiction results.  These molecules are
of the structure R-(CH2-CH2-O)n-R' or R-(CH2-CH2-CH2-O)m-R' where R
is a hydrocarbon, R' is a disk surface hydrocarbon attaching group as
used in fluorocarbon lubes, n = 3 or less and m is any number.
Specifically, it has been MIRT tested C18H37O-(CH2-CH2-O)2-C2H2OH at
a texture roughness of Rq = 38 angstroms and found 36g stiction force
for four heads where the best fluorocarbon lu...