63. Stability of Silicon Nitride Coated with Lutetium Disilicate in an Oxidative Environment

  1. Edgar Lara-Curzio and
  2. Michael J. Readey
  1. Tomohiro Suetsuna1,
  2. Motohide Ando1,
  3. Masato Ishizaki1,
  4. Tatsuki Ohji2 and
  5. Masahiro Asayama3

Published Online: 26 MAR 2008

DOI: 10.1002/9780470291191.ch63

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

Suetsuna, T., Ando, M., Ishizaki, M., Ohji, T. and Asayama, M. (2004) Stability of Silicon Nitride Coated with Lutetium Disilicate in an Oxidative Environment, 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.ch63

Author Information

  1. 1

    Synergy Ceramics Laboratory, Fine Ceramics Research Association, 2268-1 Shimo-Shidami, Moriyama-ku, Nagoya 463-8687, Japan

  2. 2

    Synergy Materials Research Center, National Institute of Advanced Industrial Science and Technology, 2268-1 Shimo-Shidami, Moriyama-ku, Nagoya 463-8687, Japan

  3. 3

    TOSHIBA CORPORATION Industrial and Power Systems & Services Company, 20-1, Kansei-cho, Tsurumi-ku, Yokohama 230-0034, Japana

Publication History

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

ISBN Information

Print ISBN: 9780470051528

Online ISBN: 9780470291191

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Keywords:

  • x-ray diffraction;
  • x-ray photoelectron spectroscopy;
  • light water reactor;
  • thermal expansion;
  • vacuum arc re-melted

Summary

Silicon nitride (Si3N4) coated with lutetium disilicate (Lu2Si2O7) was fabricated by reaction sintering after dip coating. The Lu2Si2O7 layer of about 14 μm in thickness with a small amount of silica (SiO2) phase was homogeneously formed on the Si3N4 substrate. It was also strongly jointed to the substrate and relatively dense with a few pores. The oxidation resistance of the coated Si3N4 was almost half that of the uncoated one in static air atmosphere at 1500°C for 500 hours. A corrosion test was also conducted in 30 vol%-H2O/air balance at 1.8 atm and 1500°C for 100 hours. The coating layer effectively protected the substrate from the corrosion. The flexural strength of the coated Si3N4 was not deteriorated after the oxidation and corrosion tests. These chemical and physical stabilities were attributed to the protection of Si3N4 by the coating layer of Lu2Si2O7 in an oxidative environment.