HI
Reverting back to this question, by serendipity this link came up on an
unrelated web search
www.exremetemperatureelectronics.com
Regards
Mike
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Mike Fenner
Sent: Tuesday, February 22, 2011 3:03 PM
To: [log in to unmask]
Subject: Re: [TN] Low Temp Alloys
Hi
Yes Indium maintains its ductility/flexibility in liquid gas/cryogenic
applications and is used extensively for making compression seals and so on.
As a solder it and its alloys (60In/40Pb is a near MP drop in for SN63) are
used in this zone, and have advantages, disadvantages, properties which need
to be considered. Similarly PB also remains fairly ductile.
Joyce's advice is good, the alloys are stable at that temp, everything is.
From my slightly limited experience - not too many people do this stuff and
then in specialist apps - just as in high end apps its not so much the
exposure to extremes that's the problem but cycling to and from.
So I would add that the coefficient of expansion works both ways and your
assembly, not just solder will be close to 150C outside normal documented
behaviour, just down this time not up. That's a big swing.
Regards
Mike
ü Please consider the environment before printing this e-mail
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Thayer, Wayne - IIW
Sent: Tuesday, February 22, 2011 11:29 AM
To: [log in to unmask]
Subject: Re: [TN] Low Temp Alloys
Indium Corporation of America has experts on cryogenic alloys. Indium metal
is supposed to be the most appropriate.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Graham Naisbitt
Sent: Tuesday, February 22, 2011 6:17 AM
To: [log in to unmask]
Subject: [TN]
Hillman and Pauls apparently live in such conditions. Hillman's the metals
man, he'll have an answer?
This could take a lot longer than the Friday Quiz.
BTW - for those who still work in old numbers, that's -321.1F or -196.15C
Graham N
On 22 Feb 2011, at 10:35, Sylvain Kaufmann wrote:
> Dear Technetters,
>
> I am looking for some information about solder joints / alloy behavior in
extremely low temperature environment; in this particular case, for
temperatures below 77K.
>
> I have not been very lucky so far and could not find any useful data or
papers.
>
> Do any of you have experience with such environment? Any alloy to suggest
or to stay away from? Some literature or studies that would be available
somewhere?
>
> Thanks in advance for your help and sharing your thoughts about that cold
case.
>
> Best regards
> sylvain
>
> --------------------------------------------------------------------
> Sylvain Kaufmann
> CERN / European Laboratory for Particle Physics
> Rte de Meyrin
> dpt. TE-MPE-EM
> 1211 Geneva 23
> Tel: +41 22 767 37 02
> Fax: +41 22 766 87 77
> www.cern.ch
> --------------------------------------------------------------------
>
>
>
>
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