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May 2005

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Subject:
From:
Guenter Grossmann <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Guenter Grossmann <[log in to unmask]>
Date:
Mon, 30 May 2005 09:00:10 +0200
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Ken

No I haven't read a paper, but these microcracks are frequently seen in
our lab in failure analysis. They occur due to 3 reasons (as far as I
know):
- 2 Solidification fronts meeting each other and being already too cold
to join. I believe that this is mainly a design problem.
- Shrinking of the rest- eutectic between the Sn dendrites
- Well I believe that a SnBiPb rest- eutectic is rare nowadays

Best regards

Guenter



EMPA
Swiss Federal Laboratories  for Materials Testing and Research
Centre for Reliability
Guenter Grossmann,  Senior Engineer

8600 Duebendorf
Switzerland

Phone: xx41 1 823 4279
Fax :     xx41 1 823 4054
mail:     [log in to unmask]

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