Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Investigations on Oxidation Behavior of Free-Standing CoNiCrAlYHf Coating with Different Surface Roughness at 1050 °C

Nadimullah Hakimi
ORCID logo ,
Peng Song
* ORCID logo ,
Tabasum Huma
,
Dadallah Hanifi
,
Danish Bakshyar
,
Wahab Abdul Ghafar
ORCID logo ,
Taihong Huang
*
Version 1 : Received: 8 May 2023 / Approved: 10 May 2023 / Online: 10 May 2023 (11:01:49 CEST)

A peer-reviewed article of this Preprint also exists.

Hakimi, N.; Song, P.; Huma, T.; Hanifi, D.; Bakhshyar, D.; Abdul Ghafar, W.; Huang, T. Investigations on Oxidation Behavior of Free-Standing CoNiCrAlYHf Coating with Different Surface Roughness at 1050 °C. Materials 2023, 16, 4282. Hakimi, N.; Song, P.; Huma, T.; Hanifi, D.; Bakhshyar, D.; Abdul Ghafar, W.; Huang, T. Investigations on Oxidation Behavior of Free-Standing CoNiCrAlYHf Coating with Different Surface Roughness at 1050 °C. Materials 2023, 16, 4282.

Abstract

MCrAlYHf bond coats are employed in jet and aircraft engines, stationary gas turbines, and power plants, which require strong resistance to oxidation at high temperatures. The oxidation behavior of a free-standing CoNiCrAlYHf coating was investigated in this study. Isothermal oxidation tests were performed in air at 1050 °C on the specimens with various levels of surface roughness to investigate the oxidation kinetics. X-ray diffraction, focused ion beam, scanning electron microscopy (SEM), and scanning transmission electron microscopy were used to characterize the surface oxides. The surface roughness was examined using a contact profilometer and SEM. An empirical model was proposed to elucidate the impact of surface roughness on the oxidation behavior based on the correlation between the surface roughness level and oxidation rates.

Keywords

Free-standing CoNiCrAlYHf coating; Surface roughness; Alumina scale; Oxidation kinetics

Subject

Chemistry and Materials Science, Surfaces, Coatings and Films

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Download PDF

Comments (0)

We encourage comments and feedback from a broad range of readers. See criteria for comments and our Diversity statement.

Leave a public comment
Send a private comment to the author(s)
* All users must log in before leaving a comment
Views 0
Downloads 0
Comments 0
Metrics 0
Get PDF Cite Share 0
Bookmark BibSonomy Mendeley Reddit Delicious
×
Alerts
Notify me about updates to this article or when a peer-reviewed version is published.
We use cookies on our website to ensure you get the best experience.
Read more about our cookies here.