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Development of Thermal Barrier Coatings on AZ91 Magnesium Alloy Surface

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Abstract:

In this paper, MCrAlY bonding layer was prepared through high velocity-oxygen fuel spray on the AZ91 magnesium alloy surface. 8wt%YSZ ceramic layer was deposited on the surface of bonding layer through atmospheric plasma spraying. The coatings were characterized by XRD and SEM. The hardness of the coating was tested. The coefficients of thermal expansion of the coating were measured through TMA. It was found that there were un-melted 8YSZ particles surrounded by melted particles layer by layer. Parts of ZrO2 transited from cubic to tetragonal. The microhardness of the YSZ coating and bonding layer were 832.1Hv0.3 and 700.3Hv0.3, respectively. The coefficients of thermal expansion of the magnesium alloy, MCrAlY layer and YSZ coating were 42.46 ×10-6·k-1, 15.26 ×10-6·k-1, 9.28 ×10-6·k-1, respectively. The bonding coat matched the magnesium alloy substrate and the YSZ coating well. The dimension of AZ91 magnesium alloy sample was very stabilized before and after coating deposition.

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Periodical:

Applied Mechanics and Materials (Volumes 395-396)

Pages:

703-707

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.395-396.703

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Online since:

September 2013

Authors:

Pei Hu Gao, Jian Ping Li, Zhong Yang, Yong Chun Guo, Yong Xing Wu, Ji Lin Liu, Zhi Lin Yang, Yan Rong Wang

Keywords:

Coefficient of Thermal Expansion, Magnesium Alloy, Microstructure, Thermal Barrier Coating (TBC)

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© 2013 Trans Tech Publications Ltd. All Rights Reserved

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