Impedance Spectroscopy Analysis of 7YSZ Thermal Barrier Coatings Prepared by Plasma Spray-Physical Vapor Deposition During the High-temperature Oxidation Process
CHEN Wenlong1, LIU Min2, ZHANG Jifu2, DENG Ziqian2, XIAO Xiaoling1, TANG Weixue1
1 Guangdong Industrial Analysis and Testing Center, Guangzhou 510650; 2 Guangdong Institute of New Materials, Guangzhou 510650
Abstract: The 7YSZ thermal barrier coatings(TBCs) with columnar structure were prepared on the surface of the pretreated adhesive layer by plasma spray-physical vapor deposition(PS-PVD) and their static high-temperature oxidation performance was tested at 950 ℃ in the atmosphere. Besides, The TBCs were characterized through transmission electron microscope(TEM), scanning electron microscope(SEM) and energy dispersive spectrometer(EDS), and the structure evolution of the coatings during the oxidation process at high temperature was further investigated by impedance spectroscopy. The results indicated that the 7YSZ TBCs were composed of secondary columnar grains and their nano-gaps, columnar interdendritic pores and micro-nano solid particles distributed on the columnar dendrites. Impedance analysis showed that after high temperature oxidation for 150 h, the oxygen vacancies content of TGO layer decreased as well as the density increased. During the high-temperature oxidation process, the internal structure of the secondary columnar grains did not change significantly. In addition, the sintering shrinkage micro-cracks formed during the oxidation process, which was the main cause of inducing the decrease in capacitance and the increase in resistance value of YSZ grain boundary.
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2019, Vol. 33 
