Получение термостабильных легированных углекомпозитных материалов, содержащих фазы g-C3N4, β-Si3N4 и Si2N2O

Abstract

The article proposes a technology for alloying nanostructured carbon material with Taunite nitrogen and silicon, combining mechanochemical synthesis in a spherical planetary mill and multistage heat treatment up to 1100°C. Mechanochemical methods of processing carbon material make it possible to obtain structural-phase states in it containing metastable phases and amorphous (non-crystalline) structures that cannot be realized by other methods. The selected processing parameters contribute to achieving a uniform phase distribution in the synthesized carbon composite material. The combination of mechanochemical methods and subsequent annealing becomes an alternative basis for the technology of obtaining alloyed carbon composite materials containing phases of silicon nitride and oxynitride. The main technological task in creating such a material is to achieve the necessary balance to maintain a certain balance between the phases: carbon - silicon nitride - silicon oxynitride - phases of alloying elements. The phase composition of the obtained samples was investigated by X-ray diffractometry, the porosity and distribution of chemical elements in the samples of the obtained material was estimated using X-ray tomography and scanning electron microscopy. Based on the results obtained, conclusions are formulated about the formation of phases of graphite-like carbonitride, nitride and oxynitride of silicon in a thermally stable nanocarbon material.