LaMeAl<sub>11</sub>O<sub>19</sub>(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

硅酸盐通报, 2022, 41 (7): 2474, 网络出版: 2022-08-04

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

论文大纲

蔚海浪 ^*曹学强邓龙辉蒋佳宁

作者单位

武汉理工大学硅酸盐建筑材料国家重点实验室, 武汉 430070

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。

Abstract

With the increasing application temperature of gas turbine, the CMAS resistance of ceramic materials is becoming more and more important. In this paper, the CaO-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) and anorthite (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.

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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. 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.

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