TECHNET Archives

May 2004

TechNet@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
From:
"Ingemar Hernefjord (KC/EMW)" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 5 May 2004 08:37:16 +0200
Content-Type:
text/plain
Parts/Attachments:
text/plain (97 lines)
Silver is a magnitude more apt to built such atomic chains than are Pb and Ni. In many such cases, Silver is indeed first metal to fix cap's plate connections to outer world, then nickel barrier and finally Sn or Sn/Pb. In our case, and maybe others as well, the finish was not entirely covering the Silver, and that's it...the Silver took the opportunity to migrate. Technically, we had little problem, because the low ohmic circuits 'blew' the tiny silver chains like microfuses. Cute...
Ingemar

This communication is confidential and intended solely for the addressee(s). Any unauthorized review, use, disclosure or distribution is prohibited. If you believe this message has been sent to you in error, please notify the sender by replying to this transmission and delete the message without disclosing it. Thank you.
E-mail including attachments is susceptible to data corruption, interruption, unauthorized amendment, tampering and viruses, and we only send and receive e-mails on the basis that we are not liable for any such corruption, interception, amendment, tampering or viruses or any consequences thereof.


-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Guy Ramsey
Sent: den 4 maj 2004 18:46
To: [log in to unmask]
Subject: Re: [TN] Crystalline growth across a capacitor...the next stage


As I understand it, the phenomenon is electrochemical, and the conductive
path is not pure metal but ionic compounds. I wish I had a stronger
chemistry back ground. I have not heard of Pb or Nickel involvement but both
tin and copper. Never heard of nickel.
http://www.empf.org/empfasis/feb04/sirtesting.htm

> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Vladimir Igoshev
> Sent: Tuesday, May 04, 2004 11:52 AM
> To: [log in to unmask]
> Subject: Re: [TN] Crystalline growth across a capacitor...the
> next stage
>
> I'm wondering whether all the dendrites are pure Sn? In my
> previous life I saw very similar problem with capacitors, but
> the dendrites were "made" of Pb and drew under a conformal coating.
>
> Vladimir
>
> Vladimir Igoshev, Ph. D.
> Senior Materials Researcher
> Research in Motion
> 451 Phillip St.
> Waterloo, ON, N2L 3X2
>
> Voice: (+1) 519-888-7465, ext. 5283
> Fax: (+1) 519-886-0863
> E-mail: [log in to unmask]
>
>
> -----Original Message-----
> From: Steve Gregory [mailto:[log in to unmask]]
> Sent: Tuesday, May 04, 2004 8:55 AM
> To: [log in to unmask]
> Subject: Re: [TN] Crystalline growth across a capacitor...the
> next stage
>
>
> Mornin' All!
>
> David Douthit sent me pictures to post that did jog my memory...go to:
>
> http://www.stevezeva.homestead.com
>
> and look at Capacitor Dendrites. Looks like conditions may be
> ripe in the previous pictures that I posted.
>
> -Steve Gregory-
>
>
> > Steve,
> >
> > Repost the attached jpg file showing the next stage after
> exposure to
> > moisture.
> >
> > You remember this one from last year!
> >
> > David A. Douthit
> > Manager
> > LoCan LLC
>

---------------------------------------------------
Technet Mail List provided as a 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/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
-----------------------------------------------------

---------------------------------------------------
Technet Mail List provided as a 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/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
-----------------------------------------------------

ATOM RSS1 RSS2