STUDY OF THE PROPERTIES OF AN EPOXY COMPOSITE MATERIAL FILLED WITH MODIFIED MINERAL FILLERS

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Abstract

In order to improve the properties of filled epoxy composites, in this work, the filler was processed in an induction unit at a power of 2 kW and a processing time of 60 seconds, which ensures short-term high-temperature exposure of high-frequency currents to fillers. A change in the chemical composition of fillers has been established, which is associated with the removal of unbound moisture, an oxide film from the surface of basalt and chromite particles and oxides of those substances whose decomposition temperature is lower than the modification temperature. By the method of electron microscopy, it was found that after processing in an induction installation, basalt particles largely acquire a needle shape, which has a positive effect on the physical and mechanical properties, since such a filler has a micro-reinforcement effect. For chromite particles, as a result of treatment in an induction plant, the structure changes to an insignificant extent with a partial manifestation of the needle structure. The study of the dielectric characteristics of basalt and chromite before and after treatment in an induction unit showed that the permittivity of mineral fillers significantly increases, which indicates a change in the structure of the material. The change in the chemical composition and structure of basalt and chromite after their modification by high-frequency currents leads to an increase in strength characteristics from 7 to 17%.