69. Examination of Fracture Process and Environmental Resistance of Ceramic Matrix Composites (SiC/SiC)

  1. Edgar Lara-Curzio and
  2. Michael J. Readey
  1. Mitsutoshi Okada1,
  2. Isao Yuri1,
  3. Tohru Hisamatsu1,
  4. Akito Nitta1,
  5. Tsuneji Kameda2 and
  6. Yoshiyuki Yasutomi3

Published Online: 26 MAR 2008

DOI: 10.1002/9780470291191.ch69

28th International Conference on Advanced Ceramics and Composites B: Ceramic Engineering and Science Proceedings, Volume 25, Issue 4

28th International Conference on Advanced Ceramics and Composites B: Ceramic Engineering and Science Proceedings, Volume 25, Issue 4

How to Cite

Okada, M., Yuri, I., Hisamatsu, T., Nitta, A., Kameda, T. and Yasutomi, Y. (2004) Examination of Fracture Process and Environmental Resistance of Ceramic Matrix Composites (SiC/SiC), in 28th International Conference on Advanced Ceramics and Composites B: Ceramic Engineering and Science Proceedings, Volume 25, Issue 4 (eds E. Lara-Curzio and M. J. Readey), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291191.ch69

Author Information

  1. 1

    Central Research Institute of Electric Power Industry 2-6-1 Nagasaka, Yokosuka Kanagawa-ken Japan 240-0196

  2. 2

    Toshiba Corp 2-4 Suehiro-cho, Tsurumi-ku Yokohama Japan 230-0045

  3. 3

    Japan Fine Ceramics Center 2-4-1 Mutsuno, Atsuta-ku Nagoya, Japan 456-8587

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2004

ISBN Information

Print ISBN: 9780470051528

Online ISBN: 9780470291191

SEARCH

Keywords:

  • cu-cr barrier coatings;
  • aircraft engine communities;
  • cr-nb oxides;
  • hot isostatic pressing;
  • thermal expansion

Summary

In Japan, the development of a 1700°C-class gas turbine utilizing combustion of methane (LNG) and oxygen was carried out as a national project. A ceramic matrix composite (CMC(SiC/SiC)) was focused as one of candidate materials for hot-gas-path parts, and its development and evaluation were conducted. In order to examine a relationship between bending strength and fracture process, 3-point bending tests were carried out, and they were interrupted halfway to observe the fracture of the specimen. While the CMC showed elastic behavior in a load-displacement curve, a crack was initiated initiated in the tensile side of the specimen. It was clarified that the elastic behavior of CMC was different from that of metals. In order to protect the CMC from recession under combustion gas flow, Y2SiO5 was selected as a candidate material for an environmental barrier coating (EBC). Y2SiO5 specimen, which was prepared by sintering, and Y2SiO5-coated specimen, in which Y2SiO5 was coated on CMC substrate, were prepared. Combustion gas exposure tests were performed by means of these specimens (gas temperatures 1200∼1500°C, a gas pressure of 0.3MPa, a flow velocity of 150m/s, exposure time of 5∼40hours). The utilization of Y2SiO5 for the EBC improves the environmental resistance of the CMC. However, taking long-term use in an in-service gas turbine into consideration, the development of new materials with more resistance to recession is necessary.