The Oxidation Resistance of Nonmodified and Zr-Modified Aluminide Coatings Deposited by the CVD Method

Abstract:

The aim of the present work was to determine the influence of chemical composition of the protective coating on the oxidation resistance of the protected alloy. Zirconium modified and nonmodified aluminide coatings were deposited on the MAR M200 nickel superalloy by the CVD method. The oxidation tests were conducted at 1100°C into 23 hour in the air. The chemical composition (EDS) analysis was performed. The kinetic of oxidation of zirconium modified and nonmodified aluminide coatings was similar. Oxides inclusions called pegs were observed on the surface of oxidized aluminide coating. HfO₂ oxide is more stable than Al₂O₃ oxide, hafnium atoms can replace aluminum atoms in Al₂O₃ oxides. This phenomena let to stabilize NiAl phase and increase of oxidation resistance of aluminide coating.

• Periodical: Solid State Phenomena (Volume 227)
• Pages: 361-364
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.227.361
• Online since: January 2015
• Authors: Ryszard Filip, Maryana Zagula-Yavorska*, Maciej Pytel, Jolanta Romanowska, Mateusz Maliniak, Jan Sieniawski
• Keywords: CVD Aluminizing, Oxidation Resistance, Zr-Modified Aluminide Coatings

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