I have done it both ways and have found no true anomalies between nitrogen or
non. However, in reflowing downhole, oilfield type stuff, I found great benefits
in nitrogen inertion. We had to reflow with fairly elaborate solder alloys
(80%gold, 20%tin) and on polyimid substrates, and the absence of oxygen made for
very nice robust, less grainy solder joints. As far as immersion silver is
involved, does thirourea prove to be a problem? Or is this just in Omikron White
Tin? Also, does nitrogen inertion have an effect on presence or severity of the
thiourea?
Jason Gregory
Production Supervisor
LaBarge Inc.
(918)459-2367
[log in to unmask]
Dave Chapman <[log in to unmask]> on 08/15/2002 03:47:47 PM
Please respond to "TechNet E-Mail Forum." <[log in to unmask]>; Please respond to
Dave Chapman <[log in to unmask]>
To: [log in to unmask]
cc: (bcc: Jason Gregory/LABARGE)
Subject: Re: [TN] Immersion silver
Yes we are currently running without nitrogen double sided reflow and wave
solder Immersion Silver. No problems noted on 9 assemblies run so far. We
are using both Alpha Level Silver and Mac Dermid finishes.
Dave Chapman
Manufacturing Engineer
Circuit Service Inc.
-----Original Message-----
From: Kasica, David (MED, GEMS-IT) [mailto:[log in to unmask]]
Sent: Thursday, August 15, 2002 12:45 PM
To: [log in to unmask]
Subject: [TN] Immersion silver
Hello, we are currently using nitrogen when reflowing our circuit
boards. Our circuit boards are silver immersion coated. We are trying to
reduce the amount of nitrogen that we are using in our plant and we are
looking to see what other manufacturing plants are doing. We would like
to shut off the nitrogen in our reflow ovens. Is anyone reflow soldering
(with no nitrogen) immersion silver plated boards with double reflow and
subsequently wave soldering in shadow fixtures?
Thank you,
David Kasica
> GE Medical Systems
> Information Technologies
> _________________________________________
> David Kasica
> Process Engineering Technician
> * 8200 West Tower Avenue
> Milwaukee, WI 53223
> % Phone: (414) 362 - 2494
> * Fax: (414) 362 - 3258
> * E-mail: [log in to unmask]
>
----------------------------------------------------------------------------
-----
Technet Mail List provided as a free service by IPC using LISTSERV 1.8e
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/html/forum.htm for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700
ext.5315
----------------------------------------------------------------------------
-----
---------------------------------------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8e
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/html/forum.htm for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700
ext.5315
---------------------------------------------------------------------------------
---------------------------------------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8e
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/html/forum.htm for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
---------------------------------------------------------------------------------
|
