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Open AccessArticle

Effects of Al Sputtering Film on the Oxidation Behavior of NiCrAlY Bondcoat

1
School of Material Science and Engineering, Chang’an University, Xi’an 710064, China
2
Department of Chemistry and Materials Engineering, University of Auckland, Auckland 1142, New Zealand
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Technical Center, Jinduicheng Molybdenum Co., Ltd., Xi’an 710077, China
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Three places of Technology, Northwest Industrial Group Co., Ltd., Xi’an 710043, China
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State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, China
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Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi’an 710072, China
*
Author to whom correspondence should be addressed.
Coatings 2020, 10(4), 376; https://doi.org/10.3390/coatings10040376
Received: 17 March 2020 / Revised: 5 April 2020 / Accepted: 8 April 2020 / Published: 10 April 2020
(This article belongs to the Section Plasma Coatings, Surfaces & Interfaces)
In this study, the oxidation behavior of Al coated NiCrAlY bondcoat is investigated. It is known that many methods are applied to improve the lifetime of bondcoat in thermal barrier coatings. Herein, the Al sputtering method is selected to increase the Al content, which does not change the structure of bondcoat. Thin Al film of ~2 µm was sputtered on the surface of bondcoat, which improved the oxidation resistance of NiCrAlY bondcoat. Experimental results showed that, after oxidation for 200 h at 1200 °C, the formation of a dense and continuous α-Al2O3/Cr2O3 multilayer was observed on the Al coated bondcoat surface. In contrast, a mixed oxides (NiO, Cr2O3 and spinel oxides) layer formed on the surface of the as-sprayed bondcoat samples. Results of the cyclic oxidation at 1050 °C within 204 h indicated that the Al sputtering method can improve the oxidation resistance of bondcoat. This study offers a potential way to prolong the lifetime of thermal barrier coatings and provides analysis of the oxidation mechanism. View Full-Text
Keywords: NiCrAlY bondcoat; Al film; sputtering; oxidation resistance NiCrAlY bondcoat; Al film; sputtering; oxidation resistance
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MDPI and ACS Style

Zhang, Y.; Zhang, G.; Yang, Q.; Cao, W.; Pu, J.; Zhu, C. Effects of Al Sputtering Film on the Oxidation Behavior of NiCrAlY Bondcoat. Coatings 2020, 10, 376.

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