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Re: Electrical Properties of Brass
Original poster: "Terry Fritz" <teslalist-at-qwest-dot-net>
At 09:50 AM 4/20/2003 -0700, you wrote:
>Terry, I've always wondered about this reasoning. Since the oxide layer
>has high resistance, would not there be low RF current level in it?
>Would that current, then, not have a much-reduced effect in establishing
>the RF current path? And would not the main RF current, then, seek a
>path somewhat below the oxide layer, thus entering the region of
>relatively lower resistance within the pure aluminum?
We have RF effects forcing the current to the outside and resistive effects
forcing current in.... Exactly where the current goes and what the loss
is, is an interesting problem I am sure ;-)) In a few days I am getting
some high power RF coils that are aluminum heavy plated with silver. They
work well since the currents travel in the thin silver layer. What will be
fun to see is what happens if the plating gets a crack. We "think" it will
incinerate. But have to see for sure. Stay tuned...
I or Gary Lau may be able to get two coils that are exactly the same
dimension but one is copper and the other aluminum and test the resistance
on a fancy HP machine. Soaking or boiling the aluminum one in salt water
will certainly oxidize it well. I'll ask the guys that know how to run the
HP network analyzer beast to see if that is "easy" to do.