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How does the Carbon and metal wires conductivity compares in relation with temperature increase

The evolution of electrical conductivity of metal and carbon are different with temeprature increase

  • At the opposite of carbon yarns, metallic electro heating wires generally have a resistivity that increases with temperature, giving them a slight regulating effect at high températures.
  • Carbon wires have their resistivity that decreases with temperature! At rather high températures, this may induce an acceleration of the damage through eventual hot spots

    • Compare carbon and metallic wires on the chart hereunder !

      • As for an example , for high temerature heating applications, the slightest diference of structure or damaged heating mat or wire will concentrate the current in this small zone, that becomes more and more conductive.

     

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