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Chromium copper (C18200) might work pretty well for your application. Places like Copper and Brass Sales, Jurgensen, and Ryerson would have fairly long rods in stock. Graphite (Pocco is a good source) by itself would be an ok choice for your brush. Aluminum and aluminum-graphite would be pretty susceptible to arc damage, but if you're just going to throw them away after the test, you should be alright. You could also apply a little force to the contact while sliding (more than just the weight of the rod), and you wouldn't have to worry so much about arcing. good luck --Previous Message--
leo
: --Previous Message--
: It is for a pulse application, most likely on the order of ~1 ms. I am
: going
: to use both aluminum and and copper graphite for the other contact. I think
: that aluminum will end up being the best choice as the other contact is
: disposable and needs to be lightweight.
: I have read of others using steel in a similar application, and they had
: problems with the rod plastically deforming due to the resistive heating
: and gravity, which is what I'm trying to avoid. I think maybe a
: ceramic(regular cement perhaps) coated with a suitable conductor might be
: the only good solution. Fortunately the rod should be easily replaceable.
: Unfortunately other considerations make it desirable that this rod be as
: thin as possible.
: I take it all of the tungsten alloys for contacts are made using powder
: metallurgy as well. Do you know if there are any obstacles to producing
: longer lengths, other than the low demand, with powder metallugy? I have a
: bicycle with a frame made a steel/boron composite and I have seen Ti-SiC in
: some aerospace applications, both of which at least as long as I need. I
: fear the way they work might be closer to carbon and iron in steel.
: If I am unable to eliminate arcing I'll just have to use it to my advantage
: which will require good arc resistance.
: Thanks for your help,
: Ben
: --Previous Message--
:
: Hi Ben,
: I'm not aware of any inherent length limitations associated with PM
: processing. Since you are using a pulsed application, the skin depth of the
: conductor will also be a design consideration, so I'd recommend avoiding
: any ferromagnetic material in the current path.
: Best regards,
: - Bert --
:
:
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