Funct. Mater. 2022; 29 (3): 364-370.

doi:https://doi.org/10.15407/fm29.03.364

Study of structuring processes in liquid glass compositions based on inorganic polymers under microwave irradiation in the production of heat-insulating materials

T.Rymar, O.Suvorin, L.Rodin

Volodymyr Dahl East Ukrainian National University, 59-a Tsentralnyi Pr., 93400 Severodonetsk, Ukraine

Abstract: 

The structure formation processes in liquid glass compositions with modifying additives exposed to microwave field were studied. It is shown that under microwave irradiation,the rapid coagulation and crystallization of liquid glass occur under the influence of semi-aqueous gypsum with the formation of CaSiO3. This increases the crystallinity of partitions, the strength of thermal insulation materials and water resistance, since calcium acts as a modifier of the glassy matrix, replacing sodium and forming water-insoluble silicates. Moreover, the formation of CaSiO3 under microwave irradiation at temperatures of 110-120°C occurs more intensively than during traditional convective heating even at a temperature of 600°C. The catalytic function of CaSO4·0.5H2O modifier in the contact-condensation and colloid-coagulation mechanisms of hardening of the liquid glass composition has been established. The formation of (CaSiO3) under microwave irradiation contributes to the formation of an inhomogeneous structure, which provides increased strength and water resistance of heat-insulating materials.

Keywords: 
thermal insulation materials, liquid-glass compositions, modifying additives, microwave radiation, convective heating, X-ray diffraction phase analysis.

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