Silver isn't generally the first thing I think of when I want a diffusion barrier, but I'll let those with more experience in this area teach us something! Mike?

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ricardo Moncaglieri
Sent: Thursday, June 04, 2015 4:05 PM
To: [log in to unmask]
Subject: Re: [TN] Solder Alloy SnIn - Working Environmental Conditions: -100°C to +100°C

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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