LaMgAl11O19涂层的CMAS侵蚀行为研究  

Corrosion Behavior of CMAS on LaMgAl_(11)O_(19)Coating

作　　者：王亚军 马欣新[3] 马瑞[2] 唐光泽[1] 刘玲[4] Wang Yajun;Ma Xinxin;Ma Rui;Tang Guangze;Liu Ling(School of Material Science and Engineering,Harbin Institute of Technology,Harbin 150001,China;Beijing Power Machinery Institute,Beijing 100074,China;State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin 150001,China;School of Materials Science and Engineering,Beijing institute of Technology,Beijing 100081,China)

机构地区：[1]哈尔滨工业大学材料科学与工程学院,黑龙江哈尔滨150001 [2]北京动力机械研究所,北京100074 [3]哈尔滨工业大学先进焊接与连接国家重点实验室,黑龙江哈尔滨150001 [4]北京理工大学材料科学与工程学院,北京100081

出　　处：《稀有金属材料与工程》2021年第8期2927-2932,共6页Rare Metal Materials and Engineering

摘　　要：为了研究服役过程中38CaO-5MgO-8AlO_(1.5)-49SiO_(2)(CMAS)对镁基六铝酸镧(LaMgAl_(11)O_(19))的高温侵蚀行为,利用大气等离子喷涂技术制备了LaMgAl_(11)O_(19)涂层。通过SEM、EDS和XRD表征了1050、1250℃下LaMgAl11O19涂层被CMAS侵蚀后的微观组织和相结构。结果表明,LaMgAl_(11)O_(19)涂层中在1250℃被侵蚀24 h后的腐蚀产物是CaAl_(2)Si_(2)O_(8)和MgAl_(2)O_(4)。此外,通过研究侵蚀层厚度与侵蚀温度、侵蚀时间的关系,计算得到了在1050~1250℃温度下,CMAS侵蚀LaMgAl11O19涂层的反应活化能为94.1 kJ/mol。The LaMgAl_(11)O_(19)was prepared by air plasma spraying technology to investigate the corrosion behavior of 38CaO-5MgO-8AlO_(1.5)-49SiO_(2)(CMAS)at high temperature.The microstructure,element distribution and phase composition of LaMgAl_(11)O_(19)coating before and after CMAS corrosion at 1050 and 1250℃were investigated by SEM,EDS and XRD.The results show that CaAl2Si2O8 and MgAl2O4 can be observed in LaMgAl_(11)O_(19)coating after corroded at 1250℃for 24 h.Besides,according to the thickness of corroded zone in LaMgAl_(11)O_(19)coating,the apparent activation energy in the temperature range of 1050~1250℃is 94.1 kJ/mol.

关 键 词：LaMgAl11O19 CMAS 侵蚀产物 动力学曲线 

分 类 号：V254.2[一般工业技术—材料科学与工程] TG174.442[航空宇航科学与技术—航空宇航制造工程]