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

Abstract

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

CLC Number:

TQ174

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

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