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High Precision Process for Adhesive-Connections

IP.com Disclosure Number: IPCOM000112738D
Original Publication Date: 1994-Jun-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Meyer, D: AUTHOR [+2]

Abstract

The use of melt-adhesive has certain advantages such as allowing the adjustment of the parts which have to be connected, while other adhesives e.g., fix the parts on contact.

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High Precision Process for Adhesive-Connections

      The use of melt-adhesive has certain advantages such as
allowing the adjustment of the parts which have to be connected,
while other adhesives e.g., fix the parts on contact.

      On the other hand the softening temperature of about 130
Celsius may cause inaccuracies due to the mismatch of the thermal
expansion of the parts.

Thus an ideal process should take care of two requirements:

o   immediate fixation of the parts to be connected as soon as they
    are correctly aligned at that point or area where the accuracy is
    of importance, and

o   the melt-adhesive remaining soft for a longer period and thus,
    allowing a relative movement of other areas of the parts and a
    reduction of stress caused by thermal mismatch.

      The two requirements can be fulfilled by applying a heat-sink
once the parts are aligned which allows for locally different heat
currents from the connected parts into the sink in a way that the
front-line of solidification of the adhesive moves slowly away from
the aligned end of the parts.

      In our specific application a number of ceramic parts had to be
glued to a steel fixture.  The ceramic parts had to be aligned to the
fixture and to each other by an accuracy of  1 um, while the
mismatch between fixture and parts at 130 Celsius was 40 um.

      The solution for achieving the accuracy was the alignment of
the ceramic parts with one end to a ref...