David:
Please forward a copy of your report to me. Thanks,
Greg Arslanian
Air Products and Chemicals, Inc.
7201 Hamilton Blvd.
Allentown, PA 18195
610-481-8591 (phone)
610-481-8647 (fax)
[log in to unmask]
-----Original Message-----
From: David Suraski [mailto:[log in to unmask]]
Sent: Tuesday, December 28, 1999 9:30 PM
To: [log in to unmask]
Subject: Re: [LF] Impacts of lead and copper...
Hi All,
Happy holidays! We've also done some tests pertaining to Cu and Pb in a
Pb-Free solder that will not be named due to fears of being flamed.
Anyhoo, we found that Cu would not dissolve into this composition (which had
an original Cu concentration of 0.7%) above 1% in a solder bath of 500F. As
an aside, this alloy proved superior as far as limiting Cu dissolution as
compared to Sn/Pb, Sn/Ag, and even Sn/Cu. I imagine that this probably is
quite similar to Mr. Gickler's results.
As far as Pb, the above alloy was tested with 0.5% pb-contamination (which
was deemed to be a realistic contamination level that might be experieinced
in the field) with "little or no degradation" to solder joint reliability.
I realize that the above may sound a bit subjective, but it actually was
determined through objective experimentation. If anyone (including Mr. Yuen,
of course) would like to see a copy of these tests and their results, please
feel free to contact me and I'll ship it off.
Thanks and happy new year,
David
AIM
----- Original Message -----
From: Bill Hampshire <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, December 28, 1999 7:08 PM
Subject: Re: [LF] Impacts of lead and copper...
> Hey, Mike,
>
> I bet you are talking about the paper by Al Gickler at SMI '97. I was
> the chair of that session and was happy to get that paper from Al. But
> the audience was less than appreciative. Their comments were that the
> information was too elementary and non-discriminating. I think it was
> simply about two years ahead of its time. Al has done some of the "dirty
> work" that needs to be done to test lead-frees. He found, not
> surprisingly, that lead-free compositions, already saturated with copper,
> did not pick up additional copper in simulated use. No surprise, I
> guess, but someone has to prove it!
>
> Re: reliability testing- check back thru the archives of this forum,
> especially for some of the European comments, where they have some
> experience testing lead-frees.
>
> Bill Hampshire
>
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IPCWorks -October 25-28 featuring an International Summit on Lead-Free
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For technical support contact Gayatri Sardeshpande [log in to unmask] or
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IPCWorks -October 25-28 featuring an International Summit on Lead-Free Electronic
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For technical support contact Gayatri Sardeshpande [log in to unmask] or 847-790-5365.
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