International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

The article presents the results of studies of the structure and properties of nanodispersed silicon carbide particles using the method of infrared spectroscopy of disturbed total internal reflection, as well as electret thermal analysis. Temperature ranges of the occurrence of TST in the polymer matrix have been established, which may be due to the processes of melting and oxidation of the polymer matrix, accompanied by the release of charge carriers. The activity of silicate-containing particles used to modify polymer matrices has been analyzed. It has been shown that the introduction of SiC particles into the polymer increases the intensity of TST peaks. The prospects of using ultrafine SiC particles obtained from natural raw materials for the modification of polymer materials are considered.

This work was carried out studies on the effect of different ways of modifying the microstructure and mechanical properties of cast ductile irons identical to the final chemical composition. For comparative studies have chosen three ways of modifying the molten iron, characterized the time interval between the introduction of additives into the melt and crystallization of iron – autoclave method, processing method in an open ladle ( "Sandwich process") and a method of in-mold melt processing ("Inmold-process").

It is found that the process mold inoculation molten iron a more effective compared to other methods studied, by reducing the time interval between entering modifier in liquid iron and the onset of crystallization. This in turn enables the production of castings of several grades of ductile iron in the total process stream without additional alloying and heat treatment.

Results of research testify in favor of the fluctuation hypothesis about straight line graphitization of cast iron during primary crystallization.