Abstract:

By using Ca〖DK〗(NO3)2·4H2O, Mg〖DK〗(NO3)2·6H2O and Si〖DK〗(OC2H5)4 as precursors, the mechanism of Mg/CaSiO3 prepared by the solgel method was studiedBased on phase composition, micromorphology and calcination temperature, a model of phase formation and grain growth was establishedThe results showed that network of gel was formed through the hydrolysis and aggregation of Si(OC₂H₅)₄Ca²⁺ and Mg²⁺ were embedded in the gel networkWhen the calcination temperature of the gel was below 800℃, a small amount of crystal phases were formed, and the grain size reduced gradually with increasing calcination temperature due to the break of Si—O—Si bond in the networkWhen the calcination temperature was higher than 900℃, a large amount of crystal phases were formed and the grains grew with the increase of the calcination temperature.