A few months ago I send Indium an email inquiring about low thermal EMF solders. A good choice is Sn10Pb90, or Indalloy 159.
Andy Bardagjy bardagjy.com On Thu, May 30, 2013 at 5:05 AM, Andreas Jahn <[email protected]>wrote: > > 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<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<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 > > > > ______________________________**_________________ > volt-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/** > mailman/listinfo/volt-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts> > and follow the instructions there. > _______________________________________________ volt-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
