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- Title
Study of the effect of laser treatment on the initial oxidation behaviour of Al-coated NiCrAlY bond-coat.
- Authors
Zhu, C.; Javed, A.; Li, P.; Liang, G. Y.; Xiao, P.
- Abstract
In this study, the initial oxidation behaviour of laser-treated Al/NiCrAlY bond-coat is investigated. Two approaches, (i) Al film sputtering on the surface of bond-coat and (ii) laser treatment, have been taken to enhance the oxidation resistance of NiCrAlY bond-coat. Experimental results showed that after laser treatment, the Al/NiCrAlY bond-coat exhibited a columnar dendritic microstructure without cracks and voids. A dense and continuous α-Al2O3/Cr2O3 multilayer was found to form on the bond-coat surface. Results on the cyclic oxidation at 1200 °C (for time ≤ 204 h) revealed that the laser-treated Al/NiCrAlY bond-coat exhibited better oxidation resistance compared to as-sprayed NiCrAlY, Al/NiCrAlY and laser-remelted NiCrAlY bond-coat. The formation of θ-Al2O3, NiO, Cr2O3 and NiCr2O4 spinel oxides was observed to be suppressed due to the preformed α-Al2O3 scale during initial oxidation on the surface of laser pre-oxidized Al/NiCrAlY bond-coat. Copyright © 2013 John Wiley & Sons, Ltd.
- Subjects
OXIDATION-reduction reaction; MICROSTRUCTURE; SURFACE coatings; OXIDES; DENDRITIC crystals
- Publication
Surface & Interface Analysis: SIA, 2013, Vol 45, Issue 11/12, p1680
- ISSN
0142-2421
- Publication type
Article
- DOI
10.1002/sia.5307