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Posted by leo thurmond 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--
on 6/2/2004, 5:03 pm, in reply to "Re: Sliding contact material..."
207.109.1.73
Ben:
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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