Microstructure and oxidation resistance of Pd+Zr and Pd+Hf co-doped aluminide coatings deposited on Mar-M247 nickel superalloy
J. Min. Metall. Sect. B-Metall., 59 (2) (2023) 243-254. DOI:10.2298/JMMB221205021R
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Available online 14 August 2023
(Received 05 December 2022; Accepted 07 August 2023)
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Abstract
Pd+Zr and Pd+Hf co-doped aluminide coatings were deposited on the nickel superalloy Mar-M247 by palladium electroplating followed by zirconization-aluminization or hafnization-aluminization processes. Both coatings consisted of two zones, the outer and the interdiffusion zone consisting of the β-(Ni,Pd)Al phase. Hafnium and zirconium formed inclusions deposited at the edge of the zones and near the surface (only in the Zr+Pd modified coating). The oxidation resistance of the aluminide coating co-doped with Pd+Zr was significantly better than the one co-doped with Pd+Hf. The hafnium content in the Pd+Hf co-doped coating could exceed the limit.
Keywords: Nickel superalloys; Aluminide coatings; Hafnium; Zirconium; Oxidation
Correspondence Address:
J. Romanowska,
Rzeszów University of Technology, Department of Materials Science, Faculty of Mechanical Engineering and Aeronautics, Rzeszów, Poland;
email: jroman@prz.edu.pl
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