Recession behavior of Yb2Si2O7 phase under high speed steam jet at high temperatures

Recession behavior of Yb2Si2O7 phase was examined under high speed steam jet environment between 1300 °C and 1500 °C. Yb2SiO5 phase was formed on the bulk surface by the decomposition of Yb2Si2O7 phase and the elimination of silica component at elevated temperatures. The phase ratio of Yb2SiO5/Yb2Si2O7 increased up to 1400 °C and then decreased above 1400 °C. The relative intensity of 2 2 0 peak for Yb2Si2O7 phase increased with increasing the temperatures. Fine grains were generated on the bulk surface at 1300 °C. The phase decomposition caused on the grain interior. A porous structure was formed on the bulk surface during the test at 1400 °C. Surface cracks were generated for 1400 °C test sample. A smooth surface was generated on the surface of 1500 °C test sample. The triple points of the grains were bridged with a glassy phase.