Hello
I do not imagine cadmium bearing solder being easy to acquire. The
Wikipedia entry for solder says Pb90Sn10 can be used as a replacement
for Cd70Sn30 in low thermal EMF applications:
http://en.wikipedia.org/wiki/Solder
On Thu, 30 May 2013 04:00:19 +0200, Volker Esper <[email protected]>
wrote:
By the way: does anyone know, if Agilent uses special solder alloy? I've
heard that a cadmium containing solder is used to get extremely low
thermoelectric voltages (or voltage differences).
Is that right? If so, which alloy has to be used?
Thanks
Volker
Within LT AN86 Cd60Sn40 is recommended for a limited temperature range of 0
to around 40 degrees.
http://cds.linear.com/docs/en/application-note/an86f.pdf
But: the thermal EMF is only zero against copper.
Most precision integrated (hermetical) cirquits use Kovar. (39uV/K against
copper)
Relay contacts will be either copper berillium or another material.
So in most cases a optimized solder for copper/copper connections will not
be useful.
On the other side Cd containing solders create very poisonous damps when
being heated.
With best regards
Andreas
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