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Thermal Transfer for an Oven in an UHV

  1. Aug 6, 2010 #1
    Hey, I have some questions about alumina in an ultrahigh vacuum. To heat a metal (Mo) body (~1300C) I was thinking of wrapping resistance wire covered by alumina beads into grooves along the body. Lastly I planned on placing a sheet of metal around the grooves to cover them.

    I’m not familiar with the relative importance of thermal radiation vs conductance in a vacuum. How concerned do I need to be with the thermal contact of the wire and the body? Or in a UHVacuum would radiative heating be sufficient with little reflection from the alumina beads? If so, are there any improvements I can make? Or any soft metals or thermal interface that would work at these temperatures/pressure?

    Secondly, I was going to use a series of heat shields (Ta) followed by a water-cooled copper cold wall. I’m just unsure about mounting the heat shields. I guess I was just going for designing a ceramic support system with minimal contact with the shields (is it crucial that I keep contact minimalized?). Alumina strikes me as fairly machinable so it’d be easy to construct a setup. But are there any better ceramics? It’s my understanding that Alumina has a relatively high thermal conductivity for a ceramic. Lastly I’d just like to know if anyone has useful tips or if there are any concerns I should also have about the heat shielding

    Thank you for your help, I can't say I've done this kind of construction before
     
  2. jcsd
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