LaMeAl11O19(Me=Cu,Zn)陶瓷体材料的抗CMAS性能研究

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (7): 2474-2484.

LaMeAl₁₁O₁₉(Me=Cu,Zn)陶瓷体材料的抗CMAS性能研究

蔚海浪, 曹学强, 邓龙辉, 蒋佳宁

武汉理工大学硅酸盐建筑材料国家重点实验室,武汉 430070

收稿日期:2022-03-02 修回日期:2022-05-07 出版日期:2022-07-15 发布日期:2022-08-01
通讯作者: 曹学强,博士,教授。E-mail:xcao@whut.edu.cn
作者简介:蔚海浪(1997—),男,硕士研究生。主要从事热障涂层的研究。E-mail:1315487218@qq.com
基金资助:
国家自然科学基金(92060201)

Study on CMAS Resistance of LaMeAl₁₁O₁₉(Me=Cu,Zn) Ceramic Bulk Materials

WEI Hailang, CAO Xueqiang, DENG Longhui, JIANG Jianing

State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China

Received:2022-03-02 Revised:2022-05-07 Online:2022-07-15 Published:2022-08-01

摘要/Abstract

摘要： 随着燃气涡轮机的应用温度不断提升,陶瓷材料的抗CaO-MgO-Al₂O₃-SiO₂(CMAS)性能越来越重要。通过X射线衍射(XRD)、扫描电镜(SEM)等测试方法,研究了LaMeAl₁₁O₁₉(Me=Cu,Zn)陶瓷体材料在不同温度和时间条件下的抗CMAS腐蚀行为。结果表明,LaZnAl₁₁O₁₉(LZA)和LaCuAl₁₁O₁₉(LCA)体材料的腐蚀产物都包括透辉石(Ca(Mg,Al)(Si,Al)O₇)和钙长石(CaAl₂Si₂O₈)。随着腐蚀温度的提高和时间的延长,腐蚀深度增加,Ca(Mg,Al)(Si,Al)O₇逐渐转变为CaAl₂Si₂O₈。LZA和LCA体材料的CMAS腐蚀可以用“溶解-析出”机制解释。体材料逐渐溶解到CMAS中,形成Ca(Mg,Al)(Si,Al)O₇,进而逐渐转变为CaAl₂Si₂O₈,使难以结晶的透辉石相转变为易结晶的钙长石相。La原子为析晶的晶核,CMAS玻璃相与体材料之间存在界面能,这些因素共同促进了CaAl₂Si₂O₈在CMAS内部以及两者的界面处析出厚板状晶体。

关键词: 陶瓷体材料, 抗CMAS性能, 腐蚀机理, 燃气轮机, 热障涂层, 磁铅石型稀土六铝酸盐

Abstract: With the increasing application temperature of gas turbine, the CMAS resistance of ceramic materials is becoming more and more important. In this paper, theCaO-MgO-Al₂O₃-SiO₂ (CMAS) corrosion resistance behavior of LaMeAl₁₁O₁₉ (Me=Cu,Zn) ceramic bulk materials under different temperatures and time was studied by X-ray diffraction (XRD), scanning electron microscope (SEM) and so on. The results show that the corrosion products of both LaZnAl₁₁O₁₉(LZA) and LaCuAl₁₁O₁₉ (LCA) bulk materials include diopside (Ca(Mg,Al)(Si,Al)O₇) andanorthite (CaAl₂Si₂O₈). With the increase of corrosion temperature and time, the corrosion depth increases, and Ca(Mg,Al)(Si,Al)O₇ gradually transforms into CaAl₂Si₂O₈. The CMAS corrosion of LZA and LCA bulk materials can be explained by “dissolution-precipitation” mechanism. The bulk materials gradually dissolve into the CMAS, forming Ca(Mg,Al)(Si,Al)O₇, and then gradually transform into CaAl₂Si₂O₈, so that the diopside phase which is difficult to crystallize is transformed into the anorthite phase which is easy to crystallize. La atom is the crystal nucleus of devitrification, and the interfacial energy exists between the CMAS glass phase and the bulk materials. These factors together promote the precipitation of thick plate-like crystals of CaAl₂Si₂O₈ inside CMAS and at the interface of CaAl₂Si₂O₈ and CMAS.

Key words: ceramic bulk material, CMAS resistance, corrosion mechanism, gas turbine, thermal barrier coating, magnetite rare earth hexaaluminate

中图分类号:

TQ174

蔚海浪, 曹学强, 邓龙辉, 蒋佳宁. LaMeAl₁₁O₁₉(Me=Cu,Zn)陶瓷体材料的抗CMAS性能研究[J]. 硅酸盐通报, 2022, 41(7): 2474-2484.

WEI Hailang, CAO Xueqiang, DENG Longhui, JIANG Jianing. Study on CMAS Resistance of LaMeAl₁₁O₁₉(Me=Cu,Zn) Ceramic Bulk Materials[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(7): 2474-2484.

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LaMeAl₁₁O₁₉(Me=Cu,Zn)陶瓷体材料的抗CMAS性能研究

Study on CMAS Resistance of LaMeAl₁₁O₁₉(Me=Cu,Zn) Ceramic Bulk Materials

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