高温高速燃焼ガス流中におけるLu_2Si_2O_7の耐減肉特性

概要

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In order to understand recession behavior and the amount of recession of Lu_2Si_2O_7 in the combustion gas flow, sintered Lu_2Si_2O_7 specimens were manufactured by hot pressing and exposed under various combustion gas flow conditions (T=1300〜1500℃, P=0.3MPa, V=150m/s, P_<H2O>=27〜69kPa, t=10h). After the exposure tests, etch pits, which are assumed to form due to volatilization of SiO_2 in the grain boundary phase, were observed at the surface of specimen. The amount of Lu_2SiO_5 phase at the surface of specimen increased with the increase of gas temperature or water vapor partial pressure. A corresponding decrease in the amount of Lu_2Si_2O_7 phase was observed. Furthermore, by using the average weight loss rate for exposure times of ten hours, the influence of gas temperature and water vapor partial pressure on weight loss rate was examined, and the amount of recession under gas turbine conditions was calculated. Superior environmental resistance was shown relative to Si_3N_4, SiC and Al_2O_3.
社団法人日本材料学会の論文
2005-10-15