Recession mechanism of Lu 2Si 2O 7 phase in high speed steam jet environment at high temperatures

Abstract

The phase stability and recession mechanism of Lu 2Si 2O 7 were examined in a high speed steam jet environment at 1300 and 1500 °C for a 100 h exposure time test. After high temperature steam jet exposure, a porous microstructure was formed on the exposed samples surface. Microstructural analysis indicated that the grain size of the 1500 °C sample was slightly larger than that of the 1300 °C sample. At 1300 °C, Lu 2Si 2O 7 completely decomposed to form a Lu 2SiO 5. On the other hand, both Lu 2SiO 5 and Lu 2Si 2O 7 phases were observed in the 1500 °C test sample.