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October 2010

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Wed, 27 Oct 2010 13:11:40 +0200
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Gunther,
I'll send a picture offline to you for discussion. It sounds to me as if you 
have  got exactly same problem as I had many years ago.

 / Inge


----- Original Message ----- 
From: "Grossmann, Guenter" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, October 27, 2010 9:36 AM
Subject: [TN] Cracks in BGA solderjoints


Hi Technetters

I have an effect in BGA solder joints that I have never seen before.
In microsections and in FIB preparations I see cracks between the IMC and a 
slightly darker region towards the Ni which I assume to be a P enriched zone 
of the Ni. However, the cracks are somewhere in the width of the solder 
joint and they are quite short running out to a row of pores that look 
somehow like Kirkendall voids.
Is there still a possibility to place one or two pictures? Kim's IPC site 
doesn't work.

Best regards

Günter



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