Browse Prior Art Database

Epoxy Thermoset Bonding of Actuator Pivot Bearing

IP.com Disclosure Number: IPCOM000123409D
Original Publication Date: 1998-Oct-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Prater, W: AUTHOR [+2]

Abstract

A means is disclosed to reduce corrosive volatiles in a disk drive by adhesively bonding the actuator pivot bearing using a thermoset epoxy. Reducing volatiles from acrylate adhesives can help to minimize the risk of corrosion and stiction in disk drives.

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Epoxy Thermoset Bonding of Actuator Pivot Bearing

   A means is disclosed to reduce corrosive volatiles in a
disk drive by adhesively bonding the actuator pivot bearing using a
thermoset epoxy.  Reducing volatiles from acrylate adhesives can help
to minimize the risk of corrosion and stiction in disk drives.

   Prior art actuator pivot bearings have their ball bearings
held in place using acrylate adhesives cured anaerobically and by
ultraviolet light.  Bonding of the ball bearings (1) to the shaft
(2) and sleeve (3) can be done by replacing the acrylate adhesive
with a low viscosity, low volatility one part or two-part epoxy that
is thermally cured instead.

   Analysis by isothermal thermal gravimetric analysis under
conditions of 100 degrees C for 1300 minutes has confirmed two a
part epoxy has negligable loss compared to 1% organic weight loss
for an acrylate adhesive.  The preferred epoxy has a viscosity of
less than 2000 centiPoise (cPs), which is similar to the viscosity
range for typical acrylate adhesives.  This is in the viscosity
range required for ease of dispensing by automated equipment used to
manufacture the pivot bearing.