Next Article in Journal
Optimization of Gum Arabic and Starch-Based Edible Coatings with Lemongrass Oil Using Response Surface Methodology for Improving Postharvest Quality of Whole “Wonderful” Pomegranate Fruit
Next Article in Special Issue
Effects of Roughness on Stresses in an Oxide Scale Formed on a Superalloy Substrate
Previous Article in Journal
Evaluation of Damage Process of a Coating by Using Nonlinear Ultrasonic Method
Article

Investigations on the Diffusion of Platinum between CMSX-4 Superalloy and Platinum-Enriched Bond Coat

by 1,2,*, 1 and 1
1
Department of Materials, University of Manchester, Manchester M13 9PL, UK
2
Institute for Future Transport & Cities, Coventry University, Coventry CV1 5FB, UK
*
Author to whom correspondence should be addressed.
Academic Editor: Cecilia Bartuli
Coatings 2021, 11(4), 441; https://doi.org/10.3390/coatings11040441
Received: 19 March 2021 / Revised: 7 April 2021 / Accepted: 7 April 2021 / Published: 11 April 2021
(This article belongs to the Special Issue Defects, Stresses and Cracks in Thermal Barrier Coatings)
The depletion of Pt in Pt-enriched bond coats due to inter-diffusion with superalloys has been a critical concern for the long-term oxidation resistance of thermal barrier coatings. This study investigated the diffusion behaviour of Pt between CMSX-4 superalloys and two commercial Pt-enriched bond coats comprising intermetallic γ′/γ-phase or β-phase, with the aim to understand the mechanism that leads to the depletion of Pt at high temperatures. The results demonstrated that the diffusion of Pt in superalloy disrupts its phase equilibrium, causes a significant lattice parameter misfit between the γ-phase and γ′-phase, and results in the formation of large γ′-grains with irregular shapes and random orientations. In addition, by using the Thermo-Calc software, Pt was found to have negative chemical interactions with both Al and Ta that stabilise Pt by decreasing its chemical activity. The depletion of Al due to the growth of Al2O3 scale during oxidation increases the activity of Pt and therefore accelerates the inwards depletion of Pt towards superalloys. View Full-Text
Keywords: bond coat; platinum; diffusion; thermodynamic; thermal barrier coatings bond coat; platinum; diffusion; thermodynamic; thermal barrier coatings
Show Figures

Figure 1

MDPI and ACS Style

Bai, M.; Chen, Y.; Xiao, P. Investigations on the Diffusion of Platinum between CMSX-4 Superalloy and Platinum-Enriched Bond Coat. Coatings 2021, 11, 441. https://doi.org/10.3390/coatings11040441

AMA Style

Bai M, Chen Y, Xiao P. Investigations on the Diffusion of Platinum between CMSX-4 Superalloy and Platinum-Enriched Bond Coat. Coatings. 2021; 11(4):441. https://doi.org/10.3390/coatings11040441

Chicago/Turabian Style

Bai, Mingwen, Ying Chen, and Ping Xiao. 2021. "Investigations on the Diffusion of Platinum between CMSX-4 Superalloy and Platinum-Enriched Bond Coat" Coatings 11, no. 4: 441. https://doi.org/10.3390/coatings11040441

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop