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°C,
P = 0.3 MPa,
V = 150 m/s,
PH2O = 27∼69 kPa,
t = 10 h). 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.
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