[volt-nuts] cadmium solder alloy for low thermal emf?
andy at bardagjy.com
Thu May 30 12:51:46 EDT 2013
A few months ago I send Indium an email inquiring about low thermal EMF
solders. A good choice is Sn10Pb90, or Indalloy 159.
On Thu, May 30, 2013 at 5:05 AM, Andreas Jahn <Andreas_-_Jahn at t-online.de>wrote:
> 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:
>> On Thu, 30 May 2013 04:00:19 +0200, Volker Esper <ailer2 at t-online.de>
>>> 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?
> Within LT AN86 Cd60Sn40 is recommended for a limited temperature range of
> 0 to around 40 degrees.
> But: the thermal EMF is only zero against copper.
> Most precision integrated (hermetical) cirquits use Kovar. (39uV/K against
> 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
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