Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Electrically conductive and Thermally insulating materal

  1. Feb 7, 2016 #1
    Are there any materials that are electrically conductive but are thermally insulating?
     
  2. jcsd
  3. Feb 7, 2016 #2

    Bystander

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member
    2016 Award

    How insulating/non-conductive?
     
  4. Feb 7, 2016 #3

    Nidum

    User Avatar
    Science Advisor
    Gold Member

    - and what do you want it for ?

    This type of requirement can often be met using a mechanical assembly . Many interpretations but conceptually thin wires for the electricity going through holes in sheets of good thermal insulator .
     
  5. Feb 7, 2016 #4
    I want to heat a thin electrically conductive substrate to a high temperature by passing current through it. Unfortunately the electrical wires made of copper conduct the heat away after a certain point. So, an electrical conductivity of >10^6 S/m (basically metal) to conduct the electricity, but at the same time thermal conductivity of <0.2 W/mK so that it does not conduct the heat away.
     
  6. Feb 7, 2016 #5

    Nidum

    User Avatar
    Science Advisor
    Gold Member

    Use high resistance feed wires and increase the supply voltage .

    If you use something like Nichrome wire and get your sums right the wire will get hot enough to be in thermal equilibrium with the substrate .
     
  7. Feb 9, 2016 #6

    Nidum

    User Avatar
    Science Advisor
    Gold Member

    Another way of doing the same thing is to use thermal buffering .

    Blocks or rings of copper are arranged to surround the test piece and are heated by external means to a temperature similar to that of the test piece .
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Electrically conductive and Thermally insulating materal
Loading...