燃气热冲击下7YSZ热障涂层的阻抗谱特征  

Impedance spectroscopy analysis of plasma sprayed 7YSZ thermal barrier coating after thermal cycling test

作　　者：张永[1,2] 陈文龙[2,3] 刘敏 张吉阜 许晓嫦[1] ZHANG Yong CHEN Wenlong LIU Min ZHANG Jifu XU Xiaochang(School of Materials Science and Engineering, Central South University, Changsha 410083, China Guang dong Institute of New Materials, National Engineering Laboratory for Modern Materials Surface Engineering Technology, The Key Lab of Guangdong for Modern Surface Engineering Technology Guangzhou, 510650, China School of Materials and Energy ,Guangdong University of Technology ,Guangzhou 510006 ,China)

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083 [2]广东省新材料研究所,现代材料表面工程技术国家工程实验室,广东省现代表面工程技术重点实验室,广东广州510650 [3]广东工业大学材料与能源学院,广东广州510006

出　　处：《材料研究与应用》2016年第3期191-196,共6页Materials Research and Application

摘　　要：在1250℃的燃气热冲击条件下,测试了等离子喷涂7YSZ热障涂层的抗热震性能,并采用交流阻抗技术测量了7YSZ热障涂层的阻抗谱特征.结果表明:随着热冲击循环次数增加,7YSZ热障涂层内热生长氧化物不断生长变厚,阻抗谱中频阶段的响应表现的愈加显著;同时YSZ晶界电阻值增加,电容值下降,表明YSZ内微裂纹发生了生长和扩展.Thermal cycling test of plasma sprayed 7YSZ thermal barrier coating （TBCs） was carried out with the sample surface temperature of 1250℃. The growth of thermal growth oxide layer （TGO） and microstructure evolution of YSZ were investigated by impedance spectroscopy testing. Results indicate that the thickness of TGO layer increased with increasing of thermal cycles, and the impedance response of middle frequencies were more and more remarkable. Meanwhile, the electrical resistance of YSZ grain boundaries increased with increasing of thermal cycles, but the capacitance decreased instead.

关 键 词：燃气热冲击 热障涂层 阻抗谱 

分 类 号：TG174.4[金属学及工艺—金属表面处理]