Synergistic effect of Pd+Rh on the microstructure and oxidation resistance of aluminide coatings
-
Published:2023
Issue:3
Volume:59
Page:465-476
-
ISSN:1450-5339
-
Container-title:Journal of Mining and Metallurgy, Section B: Metallurgy
-
language:en
-
Short-container-title:J min metall B Metall
Affiliation:
1. Rzeszow University of Technology, Faculty of Mechanical Engineering and Aeronautics, Rzeszów, Poland
Abstract
The Pd+Rh modified aluminide coatings were deposited on nickel and CMSX-4 nickel superalloy. The Pd layer (2.5 ?m thick) and the subsequent Rh layer (0.5 ?m thick) were electroplated on both nickel and CMSX-4. The aluminization of the substrates with Pd+Rh layers was carried out using the CVD method. Two zones (outer and interdiffusing) were observed on both coatings. The ?-NiAl phase doped in palladium was formed in the outer zones and ?-NiAl phase doped with palladium and rhodium was formed at the boundary between the outer and interdiffusion zones of both coatings. The ??- Ni3Al phase and ?-Co7Mo6 precipitates in the ?-NiAl matrix were found in the interdiffusion zone on nickel and CMSX-4 superalloy respectively. The simultaneous use of Pd and Rh in the aluminide coating slowed down their oxidation rate. Moreover, Pd+Rh co-doping is more efficient than Pd+Hf in reducing the oxidation rate of aluminide coating on CMSX-4 superalloy.
Publisher
National Library of Serbia
Subject
Materials Chemistry,Metals and Alloys,Mechanics of Materials,Geotechnical Engineering and Engineering Geology