THERMOPHYSICAL CHARACTERISTICS OF POLYMERIC COMPOSITE MATERIALS WITH CARBON COMPONENTS FOR ELECTRICAL DEVICES

Abstract

Link for citation: Minakova N.N., Ushakov V.Ya. Thermophysical characteristics of polymeric composite materials with carbon components for electrical devices. Bulletin of the Tomsk Polytechnic University. Geo Аssets Engineering, 2023, vol. 334, no. 6, рр.134-139. In Rus. The relevance of the work is caused by the need to further improve the properties of composite materials – their manufacturability, resource and energy efficiency. The scope of such materials is expanding, covering, among other things, the exploration and production of oil and gas resources, due to the possibility of regulating their properties over a wide range. Resistive and insulating products made of polymer materials with carbon components are characterized by low weight and cost, as well as the availability of raw materials and industrial manufacturing technology. The variety of processes in filled polymers used in resistive structures at elevated temperatures requires the study of their thermophysical characteristics, which determine the processes of heat transfer in the material. Heat release and heat transfer in them are realized at different levels: electrically conductive mesh immersed in a polymer matrix. This makes it relevant to study thermophysical characteristics, which are formed due to a wide range of parameters. Purpose: to study the thermophysical characteristics of rubbers filled with carbon black to increase the efficiency of their use in products and structures; to reveal the effect of carbon components on the thermophysical and structural characteristics of polymer composite materials. Methods: instrumental measurements of thermophysical characteristics of materials, X-ray diffraction, statistical and correlation analyses. Results. It was experimentally confirmed that thermophysical characteristics (heat capacity, thermal conductivity, thermal diffusivity) depend on the type of binder base. Their relationship with the physical properties of the binder base and composite material is analyzed. The dependence of thermophysical characteristics on the degree of crystallinity of the binder component in the composite material was established – with an increase in the content of the crystalline phase in the polymer, the heat capacity, thermal conductivity and thermal diffusivity increase. Recommendations are formulated for the selection of a binder material for polymer composite materials with carbon components, depending on the nature of the thermal regime of the structure, for example, when operating in non-stationary thermal regimes.