Hot-gas Corrosion Resistance of La2Ce2O7/8YSZ Duble-ceramic-layered Thermal Barrier Coating

doi:10.11902/1005.4537.2016.175

Journal of Chinese Society for Corrosion and protection

2017, Vol. 37

Issue (1): 36-40 DOI: 10.11902/1005.4537.2016.175

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Hot-gas Corrosion Resistance of La₂Ce₂O₇/8YSZ Duble-ceramic-layered Thermal Barrier Coating

Xizhong WANG¹,Jianhao WU²,Hui PENG¹,Hongbo GUO¹(

),Shengkai GONG¹

1 School of Material Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China
2 Guiyang AVIC Power Investment Casting Ltd. Co., Guiyang 550012, China

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Abstract

Double-ceramic-layered (DCL) TBCs of La₂Ce₂O₇(LC)/8YSZ were prepared by electron beam physical vapor deposition (EB-PVD) on Ni-base superalloy. The high temperature stability and corrosion-resistant property of TBCs was investigated in high temperature gas corrosion environment. The results show that no decomposition and phase transformation arises in the TBCs after 100 h exposure at 950 ℃ in the flowing air with aviation kerosene and artificial seawater. The TBCs display good high temperature gas corrosion-resistant property. A continuous and dense oxide scale forms on the bonding coat. No spallation of TBCs occurred after 100 h thermal cycling in the corrosion environment.

Key words: thermal barrier coating La₂Ce₂O₇ hot corrosion high-temperature oxidation failure

Received: 24 September 2016

Fund: Supported by National Natural Science Foundation of China (51590894, 51425102 and 51231001)

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	Xizhong WANG
	Jianhao WU
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	Shengkai GONG

Cite this article:

Xizhong WANG,Jianhao WU,Hui PENG,Hongbo GUO,Shengkai GONG. Hot-gas Corrosion Resistance of La₂Ce₂O₇/8YSZ Duble-ceramic-layered Thermal Barrier Coating. Journal of Chinese Society for Corrosion and protection, 2017, 37(1): 36-40.

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https://www.jcscp.org/EN/10.11902/1005.4537.2016.175 OR https://www.jcscp.org/EN/Y2017/V37/I1/36

Fig.1 XRD patterns of LC/8YSZ TBC specimens after gas hot corrosion for different time

Fig.2 Surface morphologies of LC/8YSZ TBCs after hot corrosion for 0 h (a), 10 h (b), 25 h (c), 50 h (d), 75 h (e) and 100 h (f)

Fig.3 Cross-sectional morphologies of LC/8YSZ TBCs after hot corrosion for 0 h (a), 10 h (b), 25 h (c), 50 h (d),75 h (e) and 100 h (f)

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