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October 1998

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Subject:
From:
Brett Goldstein <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 21 Oct 1998 15:38:44 +0000
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        Are you really looking for thermal aging data of 63/37 solder at 187
C? It reflows at 182 C, so it is a liquid (or mix of solid and
liquid, depending on the exact composition of your solder) at 187 C.
        For a bunch of charts on the effect of temperature on the tensile
strength of Sn-Pb eutectic, try Chapter 3 of the book Solder
Mechanics: A state of the art assessment, edited by Frear, published
by TMS.
        A word of warning:  These charts only give you the strength of the
solder joint initially at elevated temperatures.  Thermal aging for
any significant amount of time will change the solder's properties.
An example I remember from an experiment I performed a few years ago
in grad school:  The shear strength of a solder joint dropped 20%
after a week of aging at 100 C.  You may be really looking for
thermal cycling data, some of which you may be able to find in the
aforementioned book.

        Good luck - hope this helps you out.


Brett Goldstein
EVI, Inc.

>
> > -----Original Message-----
> > From: Malli, Reggie [SMTP:[log in to unmask]]
> > Sent: Tuesday, October 20, 1998 4:44 PM
> > To:   [log in to unmask]
> > Subject:      [TN] Thermal Aging Of Solder Joints
> > Importance:   High
> >
> > Hello there!
> >                 I'ld like to get some information regarding the  thermal
> > aging of solder joints, particularly with the following conditions:
> >
> > 1.      Solder used:
> >                 63/37  and 96/04 (4% silver)
> >
> > 2.      Product operating temperature; 187C
> >
> >         What I'm really looking for is the behaviour of solder joint
> > strength as a function of temperature. If you have any related reports or
> > literature, please email it to me or link me to the source.
> >
> >         Thanks for your help,
> >
> >         Sincerely,
> >
> >         Reggie Malli
> >         Manager Process Engineering
> >         Glenayre Manufacturing Ltd.
> >         Phone: 604-293-1611
> >         Fax: 604-293-4390
> >         Email: [log in to unmask]
> >
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