Dan Could you fax me a copy of the paper too? I am very interested in it. Thanks in advance! Fulton Feng Nortel Enterprise Network Santa Clara, Ca 95052-8173 Tel:408-565-2266 Fax:408-565-8460 >---------- >From: Dan Babcock[SMTP:[log in to unmask]] >Sent: Wednesday, October 15, 1997 3:56 PM >To: [log in to unmask] >Subject: Re: [TECHNET] Brittle Solder Joints N > >Hi Christina -- The paper entitled 'Effect Of Au On The Reliability Of >Fine Pitch Surface Mount Solder Joints" from the 1991 SMI Proceedings may >provide some helpful information. I can Fax a copy if you'd like. > >Dan Babcock >Sr. Engineer >Maxtor Corp >[log in to unmask] > >>Subject: Brittle Solder Joints >> >>Hello, >> >>I am looking for some information either from experience or papers on >>what causes brittle solder joints. We have immersion gold over nickel >>and use eutectic solder paste. Board material is high-temp FR4. I >>would like to know: >> >>1. How many heat cycles a solder joint will tolerate without becoming >>brittle. Is there a temp that a solder joint becomes brittle and the >>crystalline structure changes (as in steel tempering)? >>2. What would be the definition of a heat cycle (would it be reaching >>183 C or something else)? >>3. What is a safe temp to have boards at during a stress testing.. >> >>any information or a contact to find information would be greatly >>appreciated. >>Thanks in advance for your help, >> >>Christina Piasky ([log in to unmask]) >>Sequent Computer Systems > >############################################################## >TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c >############################################################## >To subscribe/unsubscribe, send a message to [log in to unmask] with following >text in the body: >To subscribe: SUBSCRIBE TECHNET <your full name> >To unsubscribe: SIGNOFF TECHNET >############################################################## >Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional >information. >For the technical support contact Dmitriy Sklyar at [log in to unmask] or >847-509-9700 ext.311 >############################################################## > ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ##############################################################