I think these were foil caps made of plastic, not electrolytic or
standard Tantalum, with just the foil left standing. Had the foil been
aluminum, it would have melted. Do they make Tantalum or Niobium foil
caps?
Thanks,
Carl
Carl Van Wormer, P.E.
Senior Hardware Engineer
Cipher Systems
1800 NW 169th Place, Suite B-100
Beaverton, OR 97006
Cipher Systems (503) 617-7447
Direct Line (503) 425-5163
This message may contain confidential and/or proprietary information,
and is intended for the person/entity to whom it was originally
addressed. Any use by others is strictly prohibited.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Dennis Fritz
Sent: Monday, February 16, 2009 4:01 PM
To: [log in to unmask]
Subject: Re: [TN] Capacitor construction - foil alloy question
Carl, you might have your friend check for tantalum - a common electrode
in some capacitors.? A more modern replacement for scarce tantalum is
niobium.?A quick check says that both of these melt at over 4000 F.?
?Just a thought.
Denny Fritz
-----Original Message-----
From: Carl VanWormer <[log in to unmask]>
To: [log in to unmask]
Sent: Mon, 16 Feb 2009 9:46 am
Subject: [TN] Capacitor construction - foil alloy question
This came from a friend, but I couldn't answer, so I thought of the
TechNet search engine. Can "you guys" suggest a source of information
to answer this question?
I've got a strange situation. The contents of a steel enclosure were
recovered after a large fire. The copper and brass components were
melted and fused. BUT the spiral foil from a capacitor survived inside
the same steel box. I ASSUMED it was aluminum which creates a nasty
conundrum: copper melts at 1860F, Aluminum at 1180F. BUT I've been
informed (to my chagrin) that "newer high quality"
capacitors use a nickel chromium alloy foil - do you have any experience
with this?? A quick Google search didn't turn up any immediately
recognizable information...
Thanks,
Carl
Carl Van Wormer, P.E.
Senior Hardware Engineer
Cipher Systems
1800 NW 169th Place, Suite B-100
Beaverton, OR 97006
Cipher Systems (503) 617-7447
Direct Line (503) 425-5163
This message may contain confidential and/or proprietary information,
and is intended for the person/entity to whom it was originally
addressed. Any use by others is strictly prohibited.
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