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. (paper)