Hi Edward !
The chemical composition of reduced  black oxide is mainly metalic
copper i.e. Cu $B!# (J.

Regards,
Motoyo Wajima
General Purpose Computer Division,Hitachi Ltd.(Japan)


"Eltek Ltd. - Process Engineering" <[log in to unmask]>  $B$5$s$O=q$-$^ (J
 $B$7$?!' (J
>Hi Technetters !
>Some time ago I tried to test electrical conductivity of the reduced black
>oxide : I placed a piece of conducting rubber on reduced black oxide area
>and measured conductivity between this area and the upper part of the rubber
>.The innerlayer was rinsed in DI water and dryied at 95 centigrade to take
>away any moisture . The purpose of the rubber was to avoid  scraches on
>black oxide . I was suprised , but it was conducting .
>Does anyone has explaination what is the mechanism ? I would expect , that
>dry crystals of cupric and cuprous oxide should not conduct . One of my
>friends told me , that one of crystal form of cuprous oxide is conducting .
>Best regards
>Edward Szpruch
>Eltek Ltd - Israel
>Tel  972 3 9395050
>Fax 972 3 9309581
>E-mail :  [log in to unmask]
>
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***********************************************
Motoyo Wajima
General Purpose Computer Division,Hitachi,Ltd.
1 Horiyamashita
Hadano-shi,Kanagawa-ken,259-13 Japan
E-mail:[log in to unmask]
Fax:+81-463-88-2935
***********************************************

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