Sintering mechanism and activation energy of MgAl2O4 synthesized by preceramic organomagnesiumoxanealumoxan

Abstract

A detailed study of the new method's ceramic spinel powder was carried out in the paper. A thorough analysis of the oligomer pyrolysis temperature effect on the kinetics and sintering mechanism was carried out in this work. The dependence of the change in the shrinkage and the shrinkage rate of spinel samples during non-isothermal sintering at three heating rates-5, 10, 20 °C/min were obtained. Analyzing the obtained dependencies can be concluded that an increase in the pyrolysis temperature leads to a shift in the spinel shrinkage curves towards higher values of the sintering start temperature. The data obtained were used to determine the sintering parameter of spinel powder, which corresponds to the change in the dominant sintering mechanism from viscous flow to bulk diffusion, increasing the pyrolysis temperature.