Известия Томского политехнического университета: Инжиниринг георесурсов (Oct 2020)

REGULATION OF REPRODUCTION OF POLYMER RESISTOR PARAMETERS AT INCREASED TEMPERATURES

  • Natalya N. Minakova,
  • Vasily Ya. Ushakov

DOI
https://doi.org/10.18799/24131830/2020/10/2843
Journal volume & issue
Vol. 331, no. 10
pp. 7 – 13

Abstract

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The relevance of the work is caused by the fact that resistive polymer composite materials are actively used in various electrical devices. Diversified electrical devices are made of rubber filled with carbon black, having available feedstock and the possibility of industrial manufacturing technology. Their use is constrained by the complexity of the choice of components to provide the required electrophysical properties. The scatter of parameters associated with the multicomponent structure increases the cost of raw materials for the manufacture of finished products. The main aim of the research is to assess the possibility of improving the reproducibility of properties in a series of electrical products for a specific field of operation due to prescription techniques. The objects of the research are the instability (scatter) of the temperature coefficient of resistance, a change in the volume electric resistance when heated by direct or alternating electric current of various magnitude and duration. The studied composite materials differed in concentration, brand of the electrically conductive component, and the type of polymer. Research methods: measurements of the electrophysical characteristics of resistive polymer composite materials, dispersion, regression, and correlation analyzes. Results. The authors have determined the regularities of the behavior of the variation coefficient and the temperature coefficient of resistance with a change in the concentration of the conductive filler (soot) and the type of rubber when heated by direct and alternating current in the range of applied voltage up to 1000 V. The authors developed recommendations on how to increase the uniformity of the structure of polymer composite materials designed to operate at elevated temperatures. The implementation of these recommendations helps to save the required resources (materials, energy, and time) due to the increase in reproducibility of the volume electrical resistivity when heating electrical products during operation.

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