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Dynamic Fatigue of CVD-Mullite Coated SN88 Silicon Nitride

[+] Author Affiliations
H.-T. Lin, M. K. Ferber, T. P. Kirkland, S. M. Zemskova

Oak Ridge National Laboratory, Oak Ridge, TN

Paper No. GT2003-38919, pp. 649-656; 8 pages
doi:10.1115/GT2003-38919
From:
  • ASME Turbo Expo 2003, collocated with the 2003 International Joint Power Generation Conference
  • Volume 1: Turbo Expo 2003
  • Atlanta, Georgia, USA, June 16–19, 2003
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-3684-3 | eISBN: 0-7918-3671-1
  • Copyright © 2003 by ASME

abstract

Studies of dynamic fatigue were carried out on CVD-mullite coated and uncoated of SN88 silicon nitride at 850°C and at 30 MPa/s and 0.003 MPa/s in air. The objective of the studies was to evaluate the effect of thin CVD-mullite coatings on the mechanical reliability and lifetime performance of SN88 subjected to mechanical loading conditions. Mechanical results showed that the CVD-mullite coated SN88 samples exhibited similar strength degradation and lifetime performance to those uncoated samples under similar test conditions. SEM examinations of both coated and uncoated samples after mechanical testing also showed similar development of damage zone (i.e., pores and cracking were generated in SN88 surface region) due to oxidation reaction. Results of mechanical testing and SEM examinations indicated that the CVD-mullite coating could not environmentally protect SN88 to ensure a long-term mechanical performance and lifetime in gas turbine environments.

Copyright © 2003 by ASME

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