65. Behavior of Sputter-Deposited Alumina Thin Films Under Subcritical Hydrothermal Conditions

  1. Edgar Lara-Curzio and
  2. Michael J. Readey
  1. Sang Tae Park and
  2. Ronald H. Baney

Published Online: 26 MAR 2008

DOI: 10.1002/9780470291191.ch65

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

Park, S. T. and Baney, R. H. (2004) Behavior of Sputter-Deposited Alumina Thin Films Under Subcritical Hydrothermal Conditions, 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.ch65

Author Information

  1. Department of Materials Science and Engineering University of Florida, Gainesville, FL 32611, USA

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:

  • environmental barrier coatings;
  • chemical vapor deposition;
  • silica;
  • nanoindentation tests;
  • CVD mullite coatings

Summary

Subcritical aqueous solutions have recently received much attention because of their promising properties such as a lower dielectric constant and high dissolvability. They are an integral part of PWR nuclear reactor systems. Therefore, many materials and surface modifications have been studied for the application to the reactor protection in subcritical conditions. In this study, we investigated the behavior of amorphous alumina thin films deposited on Zircaloy substrates by rf magnetron sputtering in nuclear reactor condition of subcritical water at 350°C and 20.1 MPa (3000 psi). When uniformly deposited alumina coatings were exposed to subcritical hydrothermal condition, hydrothermal crystallites formation was observed. Surface morphology was characterized by field emission secondary electron microscopy (SEM) and compositional analyses were performed using auger electron spectroscopy (AES), energy dispersive x-ray analysis (EDX) and EDX line scan. Hydrothermally grown well-faceted particulates after exposure to autoclave was observed and identified to be aluminum hydroxide, boehmite (γ-AlOOH) by x-ray diffraction (XRD) spectra and peak shift in x-ray photoelectron spectroscopy (XPS).