What about using Ag plating in place of Ni? Do you have any background?


>>> Ricardo Moncaglieri <[log in to unmask]> 04/06/2015 08:24
>>>
As per last comments better alloy should be InPb alloy always apllied
over Ni finish. Isnt it?
Do you know an specific paper/site to pick up cryogenic apps data
(InPb)?
All your advise comes good. Appreciate it so long.
Will put a glance in the David Hillman recomended book too.  

>>> Wayne Thayer <[log in to unmask]> 03/06/2015 17:51 >>>
And don't forget about the potential for nasty InCu intermetallics! If
you
go with indium, nickel plate everything first.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Mike Fenner
Sent: Wednesday, June 03, 2015 4:41 PM
To: [log in to unmask]
Subject: Re: [TN] Solder Alloy SnIn - Working Environmental
Conditions:
-100°C to +100°C

In/Sn solidus of 118C is almost certainly too low for 100C working
environment and there is not much benefit in ductility from this alloy
at
the other end.
Probably Sn63 might cope in fact, but if you have large TEC mismatch,
or
multiple cycles and other it depends stuff you might wish to look at
an
In/Pb alloy. These are good for cryogenic apps so plenty in hand and
you
have choice of MPs at other end of use scale. 
No benefit is without a cost though so you may have some surface
finish
issues. To quote myself" it's never just the melting point" when it
comes to
alloy choice. Discuss with your specialist supplier.

--
Regards 

Mike Fenner
BS&P
M: +44 [0] 7810 526 317
T: +44 [0] 1865 522 663

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ricardo
Moncaglieri
Sent: Tuesday, June 02, 2015 10:18 PM
To: [log in to unmask]
Subject: [TN] Solder Alloy SnIn - Working Environmental Conditions:
-100°C
to +100°C

Dear Colleagues,
Have to deploy a process and its qualification in order to perform
electrical connections which will be working under temperature
variations in
the range of -100°C to +100°C (space application).
We are pointing to SnIn solder alloy.
We are just now starting  our investigation in our first steps.
Will be invaluable some advise as per your background so as directing
me to
some std and/or paper about best applicable solder alloy and its
qualification method.
Being grateful in advance.
brgds, Ricardo Moncaglieri



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