21. Metal-Organic Chemical Vapor Deposition of Environmental Barrier Coatings for All-Oxide Ceramic Matrix Composites

  1. Dongming Zhu and
  2. Kevin Plucknett
  1. I. Tröster1,
  2. S. V. Samoilenkov1,
  3. G. Wahl1,
  4. W. Braue2,
  5. P. Mechnich2 and
  6. H. Schneider2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470291238.ch21

Advances in Ceramic Coatings and Ceramic-Metal Systems: Ceramic Engineering and Science Proceedings, Volume 26, Number 3

Advances in Ceramic Coatings and Ceramic-Metal Systems: Ceramic Engineering and Science Proceedings, Volume 26, Number 3

How to Cite

Tröster, I., Samoilenkov, S. V., Wahl, G., Braue, W., Mechnich, P. and Schneider, H. (2005) Metal-Organic Chemical Vapor Deposition of Environmental Barrier Coatings for All-Oxide Ceramic Matrix Composites, in Advances in Ceramic Coatings and Ceramic-Metal Systems: Ceramic Engineering and Science Proceedings, Volume 26, Number 3 (eds D. Zhu and K. Plucknett), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291238.ch21

Author Information

  1. 1

    Technical University of Braunschweig Institute for Surface Engineering, IOT Bienroder Weg 53 38108 Braunschweig Germany

  2. 2

    German Aerospace Center (DLR) Institute of Materials Research 51170 Cologne Germany

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2005

ISBN Information

Print ISBN: 9781574982336

Online ISBN: 9780470291238

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Keywords:

  • vacuum;
  • combustion;
  • microecopy;
  • aluminum;
  • aerospace

Summary

All-oxide ceramic matrix composites (CMCs) are promising candidates for structural components in key high-temperature applications, e. g. gas turbines and jet engines. Although inherently oxidation resistant, these materials are prone to corrosive attack by water vapor and other species in the combustion atmosphere. This drawback can be overcome by environmental barrier coatings (EBC) produced via metal-organic chemical vapor deposition (MOCVD), currently being under investigation at IOT. MOCVD is a convenient route to produce coatings at intermediate vacuum conditions with high deposition rates (up to 100 microns/h) and particularly advantageous for coating of complex shaped substrates. EBCs based on yttrium-aluminates are considered to exhibit high corrosion resistance in hot gas environment WHIPOX-type CMCs provided by DLR were coated by MOCVD using yttrium- and aluminum-β-diketonates. Prior to EBC deposition a bond coat was applied to substrate surfaces in order to assure good adhesion and uniform layer thickness. The coating thickness, crystallinity and morphology were characterized by x-ray diffraction, scanning electron microscopy and transmission electron microscopy.