Hi Kevin, No current seminar plans in the USA—with the economy the way it is, too many conferences, where I have given seminars, simply are no longer offered. HOWEVER, what has worked in the past, companies in areas sponsor some of my seminars of interest ( the more seminars the lower the actual expenses per seminar) to them and open them up to other companies. The sponsoring company gets of course significant benefits and reductions, the expenses are spread over 20 to 50 people from different companies, and I am available for direct consulting without the costs of traveling. This has worked very well in the past in areas with a concentration of electronics companies, like Boston, NC, CA, TX; a real WIN-WIN-WIN situation for all concerned. Werner -----Original Message----- From: Glidden, Kevin <[log in to unmask]> To: [log in to unmask] Sent: Wed, Jul 14, 2010 2:56 pm Subject: Re: [TN] silver solders and thermal fatigue resistance Thank you, Werner. How about your reliability seminars in Boston area? Any plans? ________________________________ From: Werner Engelmaier [mailto:[log in to unmask]] Sent: Wednesday, July 14, 2010 2:01 PM To: [log in to unmask]; Glidden, Kevin Subject: Re: [TN] silver solders and thermal fatigue resistance Hi Kevin, I take it, you are talking adding Ag to SnPb. The original idea, that the presence of Ag would slow down the diffusion of Ag from the component metallization, has to my knowledge, never been shown to be true. Metallurgically, such a small amount of Ag should have no significant effect on t any diffusion. The addition of Ag makes SnPb somewhat stronger, but strength and reliability behavior in solders do not correlate. Solder has two parts of its characteristics speaking against any strengthening having a beneficial fatigue behavior effect-(1) creep, (2) solder fatigue [in the T-regimes of interest] is driven by LCF, which depends on a materials ductility, not strength. Werner -----Original Message----- From: Glidden, Kevin <[log in to unmask]> To: [log in to unmask] Sent: Wed, Jul 14, 2010 1:24 pm Subject: [TN] silver solders and thermal fatigue resistance Greetings, Can anyone provide a simple description of or provide/recommend articles regarding the role of silver addition in solders? I've seen reference in several articles that it was originally used as a means to mitigate migration of silver when soldering to thick silver deposits. I've also seen reference that it also increases the thermal fatigue resistance. The latter is what I am most interested in, and would like to better understand the "why's". Thanks, Kevin Glidden ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. 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For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------