Defect Evolution and Microcracks of 8YSZ Double-layer Thermal Barrier Coatings by Water Immersion Ultrasound Macroscopic Detection

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	Defect Evolution and Microcracks of 8YSZ Double-layer Thermal Barrier Coatings by Water Immersion Ultrasound Macroscopic Detection
	Wang Lin 3; Ding KunYing 2; Lin XiaoPing 3; Li Ze 1; Zheng RunGuo 1; Yang LianWei 1
刊名	JOURNAL OF INORGANIC MATERIALS
	2019
卷号	34 期号:12 页码:1265-1271
关键词	thermal barrier coatings thermally grown oxide structure evolution water-immersion ultrasonic macroscopic examination
ISSN号	1000-324X
英文摘要	Evolution of internal structure of 8wt% Y2O3-ZrO2 (8YSZ) thermal barrier coatings during thermal shock was detected by PASCAN-64 water immersion ultrasonic equipment and scanning electron microscopy. The results show that echo signal obtained by reflection of the ultrasonic wave which is incident from vertical top coating to the bond coating mainly reflect evolution of the structure of top coating, and the echo signal obtained by reflection of ultrasonic wave which is incident from vertical basement to interface between bond coating and top coating mainly reflect evolution of structure of TGO layer, while the microstructure evolution of the whole coating is reflected by transimission signal obtained by transimission of the ultrasonic wave from vertical top coating to substrate. When porosity of the coating top coating is less than 11%, the maximum transverse size of the coating top coating is less than 50 mu m and the TGO layer is mainly dense a-Al2O3, the amplitude of the echo signal dB is less than 0. Uniform distribution of signals can be observed from corresponding images, indicating that the coating is in good condition. When the porosity of top coating is more than 44%, the maximum transverse size is more than 100 mu m, and the TGO layer is mainly composed of oxides of Cr and Co with sparse structure and thickness of more than 5.2 mu m. From the image, the area whose amplitude dB is greater than 0 is connected into pieces, which indicates the imminent failure of the coating. Water immersion ultrasound technology can accurately reflect the evolution of internal structure of thermal barrier coatings, and it is a good nondestructive testing method for internal defects of thermal barrier coatings.
资助项目	[Civil Aviation Administration Science and Technology Program Subsidized Project] ; [National Natural Science Foundation of China]
语种	英语
CSCD记录号	CSCD:6634634
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/154276]
专题	金属研究所_中国科学院金属研究所
作者单位	1.Northeastern Univ Qinhuangdao, Sch Resources & Materials, Qinhuangdao 066004, Hebei, Peoples R China 2.Civil Aviat University China, Sch Sci, Tianjin 300300, Peoples R China 3.中国科学院金属研究所
推荐引用方式 GB/T 7714	Wang Lin,Ding KunYing,Lin XiaoPing,et al. Defect Evolution and Microcracks of 8YSZ Double-layer Thermal Barrier Coatings by Water Immersion Ultrasound Macroscopic Detection[J]. JOURNAL OF INORGANIC MATERIALS,2019,34(12):1265-1271.
APA	Wang Lin,Ding KunYing,Lin XiaoPing,Li Ze,Zheng RunGuo,&Yang LianWei.(2019).Defect Evolution and Microcracks of 8YSZ Double-layer Thermal Barrier Coatings by Water Immersion Ultrasound Macroscopic Detection.JOURNAL OF INORGANIC MATERIALS,34(12),1265-1271.
MLA	Wang Lin,et al."Defect Evolution and Microcracks of 8YSZ Double-layer Thermal Barrier Coatings by Water Immersion Ultrasound Macroscopic Detection".JOURNAL OF INORGANIC MATERIALS 34.12(2019):1265-1271.