РОЛЬ МИКРОДОБАВОК В АКТИВИРОВАНИИ ТВЕРДОФАЗНЫХ РЕАКЦИЙ НА ОСНОВЕ КВАРЦА

Abstract

The article is devoted to the influence of mechanical treatment on combustion parameters in the mode of self-propagating high-temperature synthesis. The object of the study was quartz modified with polystyrene and mechanochemical processing in a planetary centrifugal mill of dynamic action. The aim of this work is to determine the regularities of the formation of the structure and morphology of particles of powder materials in the process of mechanochemical treatment, strength characteristics and characteristics of technological combustion, depending on the conditions of mechanochemical treatment and the type of modifying additive, which ensures the activation and formation of a highly dispersed structure and multilayer morphology of particles of mineral raw materials - quartz and polystyrene, as well as in the study of the physicochemical properties of the obtained self- propagating high-temperature synthesis of composites. Obtaining nanostructured self-propagating high- temperature synthesis of composites with a high level of physical and mechanical properties. Research methods: X-ray phase and X-ray structural analysis, determination of the thermokinetic characteristics of the combustion process, maximum combustion temperature, strength, density and thermal conductivity of the synthesized samples. Optimal conditions for mechanochemical treatment and self-propagating high- temperature synthesis based on quartz and polystyrene for obtaining samples with high strength and thermophysical properties have been established. The change in thermal conductivity and strength of self- propagating high-temperature synthesis of samples based on quartz and complex systems (quartz + polystyrene) is considered. It was found that due to the increased reactivity of activated and modified polystyrene, its decomposition temperature decreases, and also accelerates the interaction with the components of the charge with the formation of ultradispersed complex compounds. It plays the role of a template around which structural changes occur in a directed manner, and provides an ordered structure in the synthesized sample, which determines an increase in the strength of the material.