Hi David,
I also would like to get a copy of the report if possible.
Thanks
Achim
David Suraski schrieb:
> 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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To subscribe/unsubscribe, send a message to [log in to unmask]
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To unsubscribe: SIGNOFF Leadfree
################################################################
IPCWorks -October 25-28 featuring an International Summit on Lead-Free Electronic
Assemblies.
Please visit IPC's Center for Lead-Free Electronics Assembly
(http://www.leadfree.org ) for additional information.
For technical support contact Gayatri Sardeshpande [log in to unmask] or 847-790-5365.
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