Are there any materials that are electrically conductive but are thermally insulating?
- 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 .
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.
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 .
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 .
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