Abstract
The object of research in this study is electroconductive epoxy compositions with carbon fillers. Based on the porous structure of the filler, the technology of manufacturing composite materials in the form of films using ultrasound is proposed. The effect of the type and content of the carbon filler on the electrical properties of the epoxy composite is investigated. It is found that the resistivity in the direction perpendicular to the axis of formation of samples with content of thermally expanded graphite (normal and after ultrasonic grinding at room temperature) can reach 7.5∙10 -6 Ω∙m, while for carbon nanotubes is 5.1∙10 -8 Ω∙m. It is found that the percolation threshold for systems of epoxy resin – thermally expanded graphite is ~ 5 wt. %, and for epoxy resin systems – carbon nanotubes is ~ 1 wt. %. Research results of the effect of carbon filler on the dielectric properties of epoxy composite are presented. It is experimentally established that as the filler concentration increases, the dielectric constant increases in the polymer matrix. A sharp increase in the dielectric constant of research systems is observed with a CNT concentration of 1%. An increase in the dielectric losses of the orientational polarization is observed as the frequency of the alternating current increases to 10 5 Hz.
Highlights
The development of modern technology is associated with the creation of new materials with specified properties
Among inorganic fine- and medium-dispersed fillers, carbon fillers are widely used. These materials are of interest because they have many properties of metals and cha racteristics such as low specific gravity, corrosion resistance, and inertness to many chemicals [2]
The conducted studies aimed to determine the effect of multilayered carbon nanotubes and thermally expanded graphite on the electrical properties of epoxy composites
Summary
One of the most important tasks of industrial production in Ukraine is to improve the quality of products, reduce labor, energy and materials. The possibility of using different methods of surfacing for the purpose of repairing and obtaining surfaces of tools and parts operating under extreme conditions has a great importance [1] Such products include press molds for the production of glass insulators, as well as equipment for hot working with non-ferrous metals [2]. Plasma-MIG process with the use of a flux-cored wire ensures maximum uniformity of the deposited layer and its specified chemical composition in one pass. This is explained by the features of the process, which allows to get a shallow and wide weld pool.
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