| Defect Evolution and Microcracks of 8YSZ Double-layer Thermal Barrier Coatings by Water Immersion Ultrasound Macroscopic Detection | |
| Wang Lin1; Ding KunYing2; Lin XiaoPing1; Li Ze3; Zheng RunGuo3; Yang LianWei3 | |
| 2019 | |
| Source Publication | JOURNAL OF INORGANIC MATERIALS
 |
| ISSN | 1000-324X |
| Volume | 34Issue:12Pages:1265-1271 |
| Abstract | 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. |
| Keyword | thermal barrier coatings thermally grown oxide structure evolution water-immersion ultrasonic macroscopic examination |
| Indexed By | CSCD |
| Language | 英语 |
| Funding Project | [Civil Aviation Administration Science and Technology Program Subsidized Project] ; [National Natural Science Foundation of China] |
| CSCD ID | CSCD:6634634 |
| Citation statistics |
Cited Times:1[CSCD]
[CSCD Record]
|
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/154277 |
| Collection | 中国科学院金属研究所 |
| Affiliation | 1.中国科学院金属研究所 2.Civil Aviat University China, Sch Sci, Tianjin 300300, Peoples R China 3.Northeastern Univ Qinhuangdao, Sch Resources & Materials, Qinhuangdao 066004, Hebei, Peoples R China |
| Recommended Citation 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. |
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