Temperature dependence of electrical conduction in carbon–Epoxy resin resistors

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<jats:title>Abstract</jats:title><jats:p>It is well known that the carbon black (CB)—polymer resin resistor is advantageous because of its cheap manufacturing cost. However, there are also disadvantages such as: large temperature coefficient of resistance (TCR), and large humidity dependence of resistance. This paper attempts to clarify the mechanism of electrical conduction, especially its temperature dependence, experimentally and theoretically to obtain more information about producing low TCR resistors.</jats:p><jats:p>In general, the temperature dependence of the resistors shows a decrease in resistance at low temperatures and an increase at high temperatures with incremental temperature. Mixtures consisting of conducting particles dispersed in an insulating medium have been discussed with a split in the conduction path or a change in the barrier between conducting particles. However, it is shown that the fluctuation‐induced tunneling (FIT) model cannot explain adequately the temperature dependence of resistivity at high temperatures.</jats:p><jats:p>Temperature dependence of resistivity for the mixture made of CB and epoxy resin can be explained well with a deliberately modified conduction mechanism based upon Scarisbrick's model, incorporating the thermal expansion of resin and the thermally activated conduction process in the model.</jats:p>

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