Paper Title:
Evolution of Oxide Scales on Aluminide Coatings under Isothermal and Cyclic Conditions
  Abstract

The oxide scale evolution with high temperature on CVD aluminide coatings deposited on a Directionally Solidified (DS) Ni-base superalloy is studied in this work. High temperature oxidation was carried out at 1100°C in air for 240 h under isothermal conditions and for 10 cycles (1 cycle = 24 h at 1100°C). The morphological and microstructural characterisation of the coatings has been performed using optical and electron microscopy as well as X-ray diffraction. Contrary to most of the results published in the literature, the rumpling phenomenon appears on the isothermally oxidised specimens whereas spallation, nodule formation and wrinkling of the oxide scale occur on the cyclically oxidised samples. The results are discussed in terms of the β-NiAl to γ’-Ni3Al phase transformation, the likely associated volume changes and of the growth stresses at high temperature.

  Info
Periodical
Materials Science Forum (Volumes 595-598)
Edited by
Pierre Steinmetz, Ian G. Wright, Alain Galerie, Daniel Monceau and Stéphane Mathieu
Pages
11-16
DOI
10.4028/www.scientific.net/MSF.595-598.11
Citation
B. Bouchaud, J. Balmain, F. Pedraza, "Evolution of Oxide Scales on Aluminide Coatings under Isothermal and Cyclic Conditions", Materials Science Forum, Vols. 595-598, pp. 11-16, 2008
Online since
September 2008
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Price
$32.00
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