Cyclic-Oxidation of RexOy-Modified Aluminide Coating

Abstract:

Reactive reactive element oxide RexOy (Re=Ce, Y)-modified aluminide coatings were developed by aluminizing the as-codeposited Ni-RexOy composite film using pack cementation method at 1100°C for 4 h. By comparison, aluminizing was also performed with the same condition on an as-deposited Ni film without RexOy particles. SEM/EDAX and TEM results indicated that the co-deposited CeO₂ or Y₂O₃ particls were homogeneously dispersed in the finer-grain nanocrystalline Ni grains. The cyclic oxidation in air at 900°C indicated that the RexOy -modified aluminide coatings were profoundly spallation resistance as compared to the RexOy -free coatings due to the formation of a continuous adherent α-Al₂O₃ scale.

• Periodical: Advanced Materials Research (Volumes 557-559)
• Pages: 1721-1726
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.557-559.1721
• Online since: July 2012
• Authors: Yong Dong Wang, Yue Bo Zhou
• Keywords: Aluminide Coating, Cyclic Oxidation, Electrodeposited, Reactive Element Effect (REE)

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