预腐蚀工艺对Gd2Zr2O7陶瓷抗CMAS腐蚀性能的影响

doi:10.11902/1005.4537.2021.208

中国腐蚀与防护学报

2022, Vol. 42

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

研究报告

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预腐蚀工艺对Gd₂Zr₂O₇陶瓷抗CMAS腐蚀性能的影响

胡蕴媛¹, 钱伟², 花银群¹^,²(

), 叶云霞², 蔡杰², 戴峰泽²

^1.江苏大学新材料研究院镇江 212013
^2.江苏大学机械工程学院镇江 212013

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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摘要:

对在900、1000、1100、1200和1300 ℃下预腐蚀0.5 h的Gd₂Zr₂O₇陶瓷进行了1250 ℃下3 h的CaO-MgO-Al₂O₃-SiO₂ (CMAS) 热腐蚀实验,利用XRD、SEM以及EDS等手段表征了腐蚀产物和腐蚀深度。实验表明,在1100 ℃下预腐蚀0.5 h之后的Gd₂Zr₂O₇抗CMAS性能有效提高。1250 ℃下CMAS腐蚀3 h后,腐蚀深度为39.46 μm；CMAS腐蚀10 h后,腐蚀深度为70.49 μm。高温下,预腐蚀后的Gd₂Zr₂O₇时与熔融的CMAS相互反应,形成致密的富磷灰石相 (Ca₂Gd₈(SiO₄)₆O₂) 上反应层,能够有效抑制CMAS的进一步渗透。

关键词 ：热障涂层, Gd₂Zr₂O₇, Al₂O₃-SiO₂, (CMAS), 磷灰石相, 热腐蚀

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

收稿日期: 2021-08-23

ZTFLH:

TG174

基金资助:国家自然科学基金(51641102)

通讯作者: 花银群 E-mail: huayq@ujs.edu.cn

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

作者简介: 胡蕴媛,女,1997年生,硕士生

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引用本文:

胡蕴媛, 钱伟, 花银群, 叶云霞, 蔡杰, 戴峰泽. 预腐蚀工艺对Gd₂Zr₂O₇陶瓷抗CMAS腐蚀性能的影响[J]. 中国腐蚀与防护学报, 2022, 42(4): 687-692.
Yunyuan HU, Wei QIAN, Yinqun HUA, Yunxia YE, Jie CAI, Fengze DAI. 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.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2021.208 或 https://www.jcscp.org/CN/Y2022/V42/I4/687

图1 Gd2Zr2O7的XRD谱

图2 CMAS粉末的XRD图谱和TG-DSC图谱

图3 不同温度预腐蚀Gd2Zr2O7在1250 ℃下CMAS腐蚀5 h的截面形貌

图4 经不同温度预腐蚀的Gd2Zr2O7在1250 ℃下CMAS腐蚀3 h的反应层深度

图5 上下反应层的 SEM形貌,EDS谱及 Si、Al、Ca的元素分布图

图6 未处理和经1100 ℃/0.5 h预腐蚀的Gd2Zr2O7块体在1250 ℃下CMAS腐蚀不同时间后的截面形貌

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