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Recession behavior of Yb2Si2O7 phase under high speed steam jet at high temperatures |
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| Authors: | Shunkichi Ueno Tatsuki Ohji |
| Affiliation: | a The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan b Advanced Manufacturing Research Institute, National Institute of Advanced Industrial Science and Technology, 2268-1 Shimo-Shidami, Moriyama-ku, Nagoya 463-8687, Japan c Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6068, USA |
| Abstract: | 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. |
| Keywords: | A Ceramics B SEM XRD C Atmospheric corrosion |
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