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August 2008

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Subject:
From:
Hernefjord Ingemar <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Hernefjord Ingemar <[log in to unmask]>
Date:
Thu, 21 Aug 2008 08:54:24 +0200
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Hi Richard,

the thing is, that there is no copper! The nickel is nickel plating on Kovar part. That's why I'm confused. I have not had the opportunity to check the samples myself.

Inge

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
Sent: den 20 augusti 2008 17:35
To: [log in to unmask]
Subject: Re: [TN] Diffuse topic

Hi, Inge.
Are you sure the black area is all nickel, and not some copper? I have never seen that much nickel dissolve into the IMF before. Could it be partial copper dewetting, with some nickel near the top at the tin layer?

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Wednesday, August 20, 2008 7:00 AM
To: [log in to unmask]
Subject: Re: [TN] Diffuse topic

Mornin' Inge!

Got your picture up! Go to:

http://stevezeva.homestead.com/files/Nickel_Diffusion.jpg

Steve

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Hernefjord Ingemar
Sent: Wednesday, August 20, 2008 5:08 AM
To: [log in to unmask]
Subject: [TN] Diffuse topic

Investigation of coax Kovar/glass feed thrues soldered to nickel plated metal bodies gave, that nickel from the feed thrue's barrel nickel plating diffused as much as 38 micrometers (!)into the tin from the tin/lead solder during the vapour phase soldering. Nickel had diffused from both the feedthrue and the package.  How is that possible? Thought polish smear gave false picture, but the analyst claims that what you see is true nickel diffusion and nickel/tin IMCs. I'll ask dr Gregory for help with a photo for  you all. The sample you will see is exposed more than normal to an etchant to prove that smear is not the case..start from the bottom shows nickel (black), nickel IMCs (greyish) and topmost tin (bright). There is nearly no lead present.

Inge

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