Corrosion Behavior of Block Materials of Yttria Stabilized Zirconia with Different Content of Y2O3 in Marine Environment

doi:10.11902/1005.4537.2022.070

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (2): 359-364 DOI: 10.11902/1005.4537.2022.070

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Corrosion Behavior of Block Materials of Yttria Stabilized Zirconia with Different Content of Y₂O₃ in Marine Environment

SONG Jian, ZHOU Wenhui, WANG Jinlong(

), SUN Wenyao, CHEN Minghui, WANG Fuhui

Corrosion and Protection Division, Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang 110819, China

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Abstract

In order to solve the corrosion troubles of Yttria Stabilized Zirconia (YSZ) materials in the marine environment, two YSZ block materials with 5% and 12% (mass fraction) Y₂O₃ were prepared by powder metallurgy with a discharge plasma sintering furnace, and their corrosion performance was assessed via alternative high- and low-temperature water vapor corrosion test, aiming to simulate the marine corrosive environment, encountered for thermal barrier coatings of aero engine in service. The mechanical properties and crack formation and propagation behavior of YSZ during the alternating corrosion process of low temperature steam aging and high temperature sintering were analyzed. The results of bending strength curve show that the bending strength of 5YSZ decreases by 91.4% after 14 d of corrosion test. However, for YSZ with higher Y₂O₃ content of 12%, its bending strength does not change significantly after tested in the same environment for the same time. Therefore, the YSZ with high Y₂O₃ content has stronger stability and is more suitable for marine environment.

Key words: YSZ ZrO₂ TBCs Low temperature degradation (LTD) oxygen vacancy

Received: 14 March 2022 32134.14.1005.4537.2022.070

ZTFLH:

TG172

Fund: National Natural Science Foundation of China(51801021);Ministry of Industry and Information Technology Project(MJ-2017-J-99);Fundamental Research Funds for Central Universities(N2102015)

About author: WANG Jinlong, E-mail:Wangjinlong@mail.neu.edu.cn

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	Jian SONG
	Wenhui ZHOU
	Jinlong WANG
	Wenyao SUN
	Minghui CHEN
	Fuhui WANG

Cite this article:

SONG Jian, ZHOU Wenhui, WANG Jinlong, SUN Wenyao, CHEN Minghui, WANG Fuhui. Corrosion Behavior of Block Materials of Yttria Stabilized Zirconia with Different Content of Y₂O₃ in Marine Environment. Journal of Chinese Society for Corrosion and protection, 2023, 43(2): 359-364.

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https://www.jcscp.org/EN/10.11902/1005.4537.2022.070 OR https://www.jcscp.org/EN/Y2023/V43/I2/359

Fig.1 Bending strength curves of YSZ with different Y₂O₃ content after cyclic corrosion in high- and low-temperature alternating steam environment

Fig.2 XRD patterns of 5YSZ (a) and 12YSZ (b) for different cycles in high- and low-temperature alternating steam environment

Fig.3 M-phase volume ratio curves of 5YSZ and 12YSZ after corrosion for different time periods

Table 1 Mphase volume ratio of two groups of YSZ after corrosion for different time periods

Fig4 Surface morphologies of YSZ (a, b) and 5YSZ (c, d) after corrosion for as-prepared (a, c) and corrosion for 7 cycles (b, d) of 5YSZ in high- and low-temperature alternating steam environment

Fig.5 Schematic diagram of the corrosion process of YSZ in low temperature vapor environment: (a) in the prepared YSZ block, Y atoms dissolve into ZrO₂ crystals and forming a stable structure. The surrounding crystals of ZrO₂ are stabilized in the form of t-phase; (b) as the LTD experiments process, the water vapor induced the stable structure of YSZ to fail and the surrounded crystals of ZrO₂change to m-phase; (c) with the extension of corrosion time, almost all phase transformation processes are close to the end. Most of the crystals of ZrO₂ present with m-phase

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