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Article #58Re: Insulator with good heat conductivity
From: John Whitmore
Date: Wed, 29 Jul 1992 04:38
Date: Wed, 29 Jul 1992 04:38
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In article <7926@dirac.physics.purdue.edu> parks@gibbs.physics.purdue.edu (Chris Parks) writes: >What is a good material (good=price + availability) which is >an electrical insulator and a good conductor of heat? If your electricity is in superconductors, 'insulator' is a fair description of copper... >It will be used at temperatures as low as 4.2 Kelvin and it needs >to hold up to about 200 volts / mm, heat conductivity needs to >be comparable to copper. Does it exist? Your best bet is diamond, but you've already ruled that out (why, I can't imagine...). Do you honestly want comparable heat conductivity at 4.2K to the conductivity of copper at 4.2K? Thermal conductivity of Cu is about 4W/cm/K at room temperature, but 113W/cm/K at helium temperature. Except for diamond, your best bet is BeO (highly toxic, by the way!) but the only data I have is for higher temperatures (125 BTU-in/hr/sq. ft/F). John Whitmore
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Path: arc1-ca.pugleaf.net!sparky!uunet!zaphod.mps.ohio-state.edu!uakari.primate.wisc.edu!usenet.coe.montana.edu!news.u.washington.edu!milton.u.washington.edu!whit From: whit@milton.u.washington.edu (John Whitmore) Newsgroups: sci.materials Subject: Re: Insulator with good heat conductivity Message-ID: <1992Jul29.043801.21860@u.washington.edu> Date: 29 Jul 92 04:38:01 GMT References: <7926@dirac.physics.purdue.edu> Sender: news@u.washington.edu (USENET News System) Distribution: na Organization: University of Washington, Seattle Lines: 21