I recently purchased the text "Solder Mechanics-A State of the Art
Assessment" for a very reasonable $10.00, published by the TMS
technical society, edited by D. Frear, W. Jones, & K. Kinsman,
424 pp., 1991.
I believe you can order the text via the TMS web site.
According the Pb-Sn equilibrium phase diagram on pg. 2, the eutectic
is at
61.9 wt.% Sn, @ 183 deg C, or- 73.9 atomic % Sn.
The cited refence for this diagram is:
I. Karakaya & W. T. Thompson, Bull. Alloy Pha. Dia., 1988, vol. 9,
pp.144-152
[log in to unmask]
Lockheed Martin
______________________________ Reply Separator _________________________________
Subject: Re: Sub: Solder Paste Plastic or Eutectic
Author: [log in to unmask] at _internetcc
Date: 11/23/96 1:02 PM
Dave, you said:
> The true
> eutectic for tin/lead is 61.9%tin/38.1%lead (183C)- everyone calls
> 63/37 or 60/40 eutectic but they are really near eutectic alloys.
Hmmm. I have seen dozens of references which show 63.0%/37.0% to be the
eutectic composition for tin-lead binary alloys, and this is the first time
I've seen otherwise.
Anybode got a new edition of Hansen? I'd like to see confirmation,
otherwise I'll keep my solder post as close as possible to 63% tin. We'd
all be able to save some money if you are!
regards,
Jerry Cupples
Interphase Corporation
Dallas, TX USA
http://www.iphase.com
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