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Exposure Test Results of Lu2Si2O7 in Combustion Gas Flow at High Temperature and High Speed

[+] Author Affiliations
Isao Yuri, Tohru Hisamatsu

Central Research Institute of Electric Power Industry, Yokosuka, Kanagawa, Japan

Shunkichi Ueno, Tatsuki Ohji

National Institute of Advanced Industrial Science and Technology, Nagoya, Japan

Paper No. GT2004-54277, pp. 461-466; 6 pages
doi:10.1115/GT2004-54277
From:
  • ASME Turbo Expo 2004: Power for Land, Sea, and Air
  • Volume 2: Turbo Expo 2004
  • Vienna, Austria, June 14–17, 2004
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-4167-7 | eISBN: 0-7918-3739-4
  • Copyright © 2004 by ASME

abstract

In order to understand recession behavior and the amount of recession of Lu2 Si2 O7 in the combustion gas flow, sintered Lu2 Si2 O7 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 = 10h). After the exposure tests, etch pits, which are assumed to form due to volatilization of SiO2 in the grain boundary phase, were observed at the surface of specimen. The amount of Lu2 SiO5 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 Lu2 Si2 O7 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.

Copyright © 2004 by ASME

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