LaMeAl_(11)O_(19)(Me=Cu,Zn)陶瓷体材料的抗CMAS性能研究  

Study on CMAS Resistance of LaMeAl_(11)O_(19)(Me=Cu,Zn)Ceramic Bulk Materials

作　　者：蔚海浪 曹学强[1] 邓龙辉[1] 蒋佳宁 WEI Hailang;CAO Xueqiang;DENG Longhui;JIANG Jianing(State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学硅酸盐建筑材料国家重点实验室,武汉430070

出　　处：《硅酸盐通报》2022年第7期2474-2484,共11页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(92060201)。

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-Al_(2)O_(3)-SiO_(2)(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LaMeAl_(11)O_(19)(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,LaZnAl_(11)O_(19)(LZA)和LaCuAl_(11)O_(19)(LCA)体材料的腐蚀产物都包括透辉石(Ca(Mg,Al)(Si,Al)O_(7))和钙长石(CaAl_(2)Si_(2)O_(8))。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)O_(7)逐渐转变为CaAl_(2)Si_(2)O_(8)。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)O_(7),进而逐渐转变为CaAl_(2)Si_(2)O_(8),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CaAl_(2)Si_(2)O_(8)在CMAS内部以及两者的界面处析出厚板状晶体。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-Al_(2)O_(3)-SiO_(2)(CMAS)corrosion resistance behavior of LaMeAl_(11)O_(19)(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 LaZnAl_(11)O_(19)(LZA)and LaCuAl_(11)O_(19)(LCA)bulk materials include diopside(Ca(Mg,Al)(Si,Al)O_(7))and anorthite(CaAl_(2)Si_(2)O_(8)).With the increase of corrosion temperature and time,the corrosion depth increases,and Ca(Mg,Al)(Si,Al)O_(7)gradually transforms into CaAl_(2)Si_(2)O_(8).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)O_(7),and then gradually transform into CaAl_(2)Si_(2)O_(8),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 CaAl_(2)Si_(2)O_(8)inside CMAS and at the interface of CaAl_(2)Si_(2)O_(8)and CMAS.

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 

分 类 号：TQ174[化学工程—陶瓷工业]