Is it also part of their norms? Cheers Dewey -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Hernefjord Ingemar Sent: Friday, August 31, 2007 5:55 AM To: [log in to unmask] Subject: Re: [TN] Plasma "oxidation" Hi Dave! In fact, that is what I wanted to hear! Ditto Bev. If my decision is anchored in the rockwell&rim cliffs, that's enough. Thanks both. Alea acta est... /Inge -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of David D. Hillman Sent: den 31 augusti 2007 14:08 To: [log in to unmask] Subject: Re: [TN] Plasma "oxidation" Hi Inge! Apparently, the lack of material science knowledge can go a long way. Just because a metal oxidizes, doesn't necessarily mean it can't play a role in electrochemical migration. And silver oxide is as conductive as silver metal (silver is one of those metals with some pretty wild properties). Sorry, I don't buy the "plasma oxidation" process validity. Dave Hillman Rockwell Collins [log in to unmask] Hernefjord Ingemar <[log in to unmask]> Sent by: TechNet <[log in to unmask]> 08/31/2007 03:52 AM Please respond to TechNet E-Mail Forum <[log in to unmask]>; Please respond to Hernefjord Ingemar <[log in to unmask]> To [log in to unmask] cc Subject [TN] Plasma "oxidation" Yup. Strange title. I've been asked about a strange process, which one was introduced without my knowledge, and I'm going to throw it out. But I thought of consulting TN before. This is the case: LTCC substrates are silver epoxy dispensed for chip mounting. In order to avoid risk for silver migration, a guy invented plasma "oxidation", i.e. he use a plasma cleaner, runs Argon with 6% Oxygen for a couple of minutes on mounted substrates. The silver epoxy dots become blackish because of oxidation, and oxidized epoxy is meant to minimize risk for silver migration. The oxide is of course just nanometer thick. The guy worked at a wafer manufacturing plant and had experience of cleaning procedures. I mean that this process is nonsense. If humidity gets in and condense on the substrate, and if the electric field is high enough, and if there are salts or contaminations, there is still enough silver to start migration. Oxidation of the silver dot's surface is meaningless. Anyone heard of such a strange process? Plasma operation on mounted LTCC substrates is foreign to me, I want it out. TrikeMan? Inge --------------------------------------------------- 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 ----------------------------------------------------- --------------------------------------------------- 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 ----------------------------------------------------- --------------------------------------------------- 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 ----------------------------------------------------- --------------------------------------------------- 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 -----------------------------------------------------