等离子喷涂-物理气相沉积7YSZ热障涂层高温氧化过程中的阻抗谱分析

doi:10.11896/cldb.201904007

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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.

Key words： plasma spray-physical vapor deposition columnar structure thermal barrier coating high-temperature oxidation impedance spectroscopy

Published: 11 March 2019

CLC number:

TG174

Fund:This work was financially supported by the Ph.D. Talent Foundation of Guangdong Academy of Sciences (2018GDASCX-0953), the Special Foundation for Innovation Capacity Building of Scientific Research Institutions of Guangdong Academy of Sciences (2017GDASCX-0114), the Special Foundation for Public Welfare Research and Capacity Building of Guangdong Academy of Sciences (2017A070701021).

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	Articles by authors
	CHEN Wenlong
	LIU Min
	ZHANG Jifu
	DENG Ziqian
	XIAO Xiaoling
	TANG Weixue

Cite this article:

CHEN Wenlong,LIU Min,ZHANG Jifu, et al. Impedance Spectroscopy Analysis of 7YSZ Thermal Barrier Coatings Prepared by Plasma Spray-Physical Vapor Deposition During the High-temperature Oxidation Process[J]. Materials Reports, 2019, 33(4): 605-606.

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http://www.mater-rep.com/EN/10.11896/cldb.201904007 OR http://www.mater-rep.com/EN/Y2019/V33/I4/605

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