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 degrees C and 1500 degrees 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 degrees C and then decreased above 1400 degrees C. The relative intensity of 220 peak for Yb2Si2O7 phase increased with increasing the temperatures. Fine grains were generated on the bulk surface at 1300 degrees C. The phase decomposition caused on the grain interior. A porous structure was formed on the bulk surface during the test at 1400 degrees C. Surface cracks were generated for 1400 degrees C test sample. A smooth surface was generated on the surface of 1500 degrees C test sample. The triple points of the grains were bridged with a glassy phase. (c) 2007 Published by Elsevier Ltd.