Study of Cerium State in the Process of Self-propagating High-temperature Synthesis

In this paper, thermit was used as the heat source of self-propagating reaction. The main components of sand, Al2O3 and SiO2 were selected as the curing materials with adding 5% CeO2 as the simulated nuclide. The reaction process of simulated nuclide at high temperature and the existing form in the solidification were analysed and characterized by TG-DSC and XRD. The results showed that the obtained solidifications were amorphous glass and ceramic phases. In the Al2O3 and CeO2 system, the reaction temperature was 1320 °C, and Ce was mainly in the form of CeAl11O18 in the solidification. In the system of SiO2 and CeO2, the reaction temperature was 1280 °C, and Ce was mainly in the form of Ce2SiO5 in the solidification.