Effect of Pre-corrosion of Gd2Zr2O7 at 900-1300 ℃ on Its Hot Corrosion Behavior at 1250 ℃ Beneath Deposites of CaO-MgO-Al2O3-SiO2

doi:10.11902/1005.4537.2021.208

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (4): 687-692 DOI: 10.11902/1005.4537.2021.208

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Effect of Pre-corrosion of Gd₂Zr₂O₇ at 900-1300 ℃ on Its Hot Corrosion Behavior at 1250 ℃ Beneath Deposites of CaO-MgO-Al₂O₃-SiO₂

HU Yunyuan¹, QIAN Wei², HUA Yinqun¹^,²(

), YE Yunxia², CAI Jie², DAI Fengze²

^1.School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China
^2.School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China

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Abstract

The Gd₂Zr₂O₇ ceramics, as a candidate material for making thermal barrier coating, was subjected firstly to pre-corrosion beneath deposits of CaO-MgO-Al₂O₃-SiO₂ (CMAS) powders in temperature range of 900-1300 ℃ for 0.5 h, afterwards, the pre-corroded Gd₂Zr₂O₇ ceramics were subjected to CMAS induced hot corrosion at 1250 ℃ for 3 h. Then the corroded ceramics were characterized by means of XRD, SEM and EDS in terms of the composition and phase constituent of corrosion products and cross-sectional morphology of the corroded ceramics. Results reveal that after being pre-corroded beneath CMAS deposits at 1100 ℃, the ceramics present better corrosion resistance rather than the blank ceramics during the post-corrosion beneath CMAS deposits at 1250 ℃. Which presented corrosion depth of 39.46 and 70.49 μm after CMAS induced hot corrosion at 1250 ℃ for 3 and 10 h respectively. It is proposed that during the pre-corrosion, the Gd₂Zr₂O₇ could react with the melt CMAS at 1250 ℃ to form a dense top reaction scale riched in apatite (Ca₂Gd₈(SiO₄)₆O₂), which can effectively inhibit the further penetration of CMAS during the post corrosion process induced by CMAS deposits.

Key words: thermal barrier coating Gd₂Zr₂O₇ CaO-MgO-Al₂O₃-SiO₂ (CMAS) apatite hot corrosion

Received: 23 August 2021

ZTFLH:

TG174

Fund: National Nature Science Foundation of China(51641102)

Corresponding Authors: HUA Yinqun E-mail: huayq@ujs.edu.cn

About author: HUA Yinqun, E-mail: huayq@ujs.edu.cn

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	Yunyuan HU
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Cite this article:

HU Yunyuan, QIAN Wei, HUA Yinqun, YE Yunxia, CAI Jie, DAI Fengze. Effect of Pre-corrosion of Gd₂Zr₂O₇ at 900-1300 ℃ on Its Hot Corrosion Behavior at 1250 ℃ Beneath Deposites of CaO-MgO-Al₂O₃-SiO₂. Journal of Chinese Society for Corrosion and protection, 2022, 42(4): 687-692.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2021.208 OR https://www.jcscp.org/EN/Y2022/V42/I4/687

Fig.1 XRD pattern of as-prepared bulk Gd₂Zr₂O₇

Fig.2 XRD pattern (a) and TG-DSC curves (b) of CMAS powders

Fig.3 Cross sections of Gd₂Zr₂O₇un-treated (a) and pre-treated at 900 ℃ (b), 1000 ℃ (c) and 1100 ℃ (d) after 3 h CMAS corrosion at 1250 ℃

Fig.4 Thicknesses of the reaction layers formed on Gd₂Zr₂O₇ pre-corroded at different temperatures after CMAS corrosion at 1250 ℃ for 3 h

Fig.5 SEM images of the upper (a) and bottom (b) reaction layers, EDS analysis (c) at the point 1 in Fig.5a and EDS mappings of Si (d), Al (e), Ca (f)

Fig.6 Cross sections of Gd₂Zr₂O₇untreated (a-c) and pre-corroded (d-f) under the condition of 1100 ℃/0.5 h after CMAS corrosion at 1250 ℃ for 5 min (a, d), 5 h (b, e) and 10 h (c, f)

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