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Reply To: | TechNet E-Mail Forum. |
Date: | Mon, 24 Jan 2000 15:36:42 -0500 |
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Hi, TechNetters
We're interested in SN5 and Indium type high temp solders, whose temp
range is -55 to 190C.
Questions:
1) We need info. on the mechanism that causes solder spreading over
adjacent gold plated surfaces at sub-solidus temperatures. We need this
for Sn-Pb and Pb-In solders.
2) We need Young's Modulus and Poisson's Ratio for 81Pb-19In solder.
(We already have thermal expansion = 27 E-6 , Tensile = 5550 psi)
3) Any fatigue life curves for these types of solder (Solders which are
OK over gold plating; operating temp. to +200C).
4) Study results for thermal cycle life of various thru-hole soldered
copper leads in polymer PWB (various thickness up to 0.1").
Any information about this subject is highly appreciated.
Kang Zhang
University of Maryland
College Park, MD 20783
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