Women are always different, where ever you are,  aren't they...he-he
You say IMCs are always thin, too thin for observation. Then you have to eat your hat soon, Werner, because our Ni/Tin IMC is many microns! Prof Johander at IVF (think you know him)made an investigation for us and found very thick IMCs. What is this? Guru W vs prof J? If you have time, I would like to send some pictures to you.
Thx for a minute of attention
Ingemar


-----Original Message-----
From: [log in to unmask] [mailto:[log in to unmask]]
Sent: den 19 januari 2001 15:27
To: [log in to unmask]; [log in to unmask]
Subject: Re: [TN] squashed pancakes


Hi Ingemar,
And there I always thought Swedish women were different...
The reason solder balls are called solder balls is because that is what you
start out with on the component. What happens during reflow will depend on
other things, of course.
I have not heard anything special about Ni3Sn4 IMC layers--IMCs are all
brittle, but with some exceptions also strong. However, your crystal-analogy
may be applicable. Do you get fractures actually in the IMC? Typically
Ni-IMCs are too thin for observation. The NIST-researchers did some work with
IMCs, as did the Swedish Metal Research Institute--maybe we can get some
answers there.

Werner Engelmaier

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