Paper Title:
Development of Chromium and Aluminum Coatings on Superalloys by Pack-Cementation Technique
  Abstract

Austenitic nickel-iron-chromium based superalloys are materials of choice for high temperature applications as they provide high temperature creep resistance associated with a suitable oxidation behavior in the temperature range of 600-1100°C. However, these properties are not sufficient for applications as Steam Methane Reformer (SMR). As a consequence, aluminum and chromium coatings are developed by the pack-cementation technique to improve their corrosion resistance. The oxidation behavior of the coated samples has been carried out in air at 1050°C. Chromium deposition leads to a layer of bcc chromium-iron solid solution. Oxidation tests indicated that a too high chromium concentration induces a too rapid growth of the chromia layer. In the case of aluminum coatings, a layer of -NiAl is formed at the surface of the alloy. It permits a significant decrease of the oxidation rate.

  Info
Periodical
Edited by
M. Heilmaier
Pages
491-496
DOI
10.4028/www.scientific.net/AMR.278.491
Citation
X. Ledoux, M. Vilasi, S. Mathieu, P. J. Pantiex, P. Del-Gallo, M. Wanger, "Development of Chromium and Aluminum Coatings on Superalloys by Pack-Cementation Technique", Advanced Materials Research, Vol. 278, pp. 491-496, 2011
Online since
July 2011
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