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1364 |
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Wednesday, June 04, 2008, Room 04 3:00 PM Gasturbines 5 Coatings for mobile and stationary turbines, protection against wear, high temperature corrosion and thermal stresses, clearance control coatings for a better efficiency |
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Microstructure and thermophysical properties of plasma sprayed YSZ coatings derived from La2O3 modified YSZ feedstock particles |
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Shunyan Tao* / Shanghai Institute of Ceramics, Chinese Academy of Sciences, China Yun Liu / Shanghai Institute of Ceramics, Chinese Academy of Sciences, China Xiaming Zhou/ Shanghai Institute of Ceramics, Chinese Academy of Sciences, China Hongjie Luo/ Shanghai Institute of Ceramics, Chinese Academy of Sciences, China Chuanxian Ding/ Shanghai Institute of Ceramics, Chinese Academy of Sciences, China |
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Plasma sprayed nanostructured YSZ coatings possessed better thermal shock resistance than the conventional coatings. But, its sintering at high temperature are among the most important issues for the development of advanced thermal barrier coatings, as been recognized by many investigators. The dopants in the coatings can significantly modify the point defect and microstructures in the bulk, at splat-grain boundaries and microcrack surfaces of the materials, thereby can significantly affect the sintering process. A better understanding of the dopant effects will help to develop future advanced sintering resistant ceramic coatings. The purpose of this paper is to evaluate the effect of rare-earth oxide dopants on the microstructure and thermophysical properties during sintering kinetics investigation of ZrO2-8wt%Y2O3 (YSZ) ceramic coating deposited by plasma spraying. The coating sintering mechanism and dopant effect on microstructure, thermophysical properties, and coating sintering rates are discussed based on experimental observations and possible defect reactions. |