NiCr, correct. You start deposition of a few nm NiCr layer on the PET film, then you add Al to a thickness of some um, then roll the cigar. NiCr does not melt until some 2300F, depending on what W%.
Inge
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Dennis Fritz
Sent: tisdag 17 februari 2009 01:01
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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