Abstract
A new Al-enriched γ’-Ni3Al bond coat was developed and its oxidation behaviour was examined and compared to that of conventional Pt-diffused γ/γ’ coatings and β-NiPtAl coatings. This γ’-Ni3Al coating exhibited significantly reduced elemental interdiffusion with the substrate during oxidation compared to two conventional coatings. Although Al-enriched γ’-Ni3Al coatings presented faster thermal grown oxide (TGO) growth than the β-NiPtAl coating, it outperformed β-NiPtAl coatings regarding the rumpling resistance during cycling. The Al-enriched γ’-Ni3Al coating also exhibited superior TGO spallation resistance compared to Pt-diffused γ/γ’ coatings. The mechanisms for the reduced interdiffusion and good rumpling resistance of this γ’-Ni3Al coating are addressed.
| Original language | English |
|---|---|
| Article number | 108523 |
| Journal | Corrosion Science |
| Volume | 167 |
| Early online date | 5 Feb 2020 |
| DOIs | |
| Publication status | Published - 1 May 2020 |
| Externally published | Yes |
Bibliographical note
NOTICE: this is the author’s version of a work that was accepted for publication in Corrosion Science. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Corrosion Science, 167, (2020)DOI: 10.1016/j.corsci.2020.108523
© 2020, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Funding
| Funders | Funder number |
|---|---|
| Rolls-Royce plc |
Keywords
- A. metal coatings
- B. Raman spectroscopy
- B. thermal cycling
- C. Oxide coatings
- C. oxidation
ASJC Scopus subject areas
- General Chemistry
- General Chemical Engineering
- General Materials Science