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http://dx.doi.org/10.5695/JKISE.2016.49.6.595

Fabrication and Characteristics of Thermal Barrier Coatings in the La2O3-Gd2O3-ZrO2 System by Using Suspension Plasma Spray with Different Suspension Preparations  

Lee, Soyul (Engineering Ceramics Center, Korea Institute of Ceramic Engineering and Technology)
Lee, Sung-Min (Engineering Ceramics Center, Korea Institute of Ceramic Engineering and Technology)
Oh, Yoon-Suk (Engineering Ceramics Center, Korea Institute of Ceramic Engineering and Technology)
Kim, Hyung-Tae (Engineering Ceramics Center, Korea Institute of Ceramic Engineering and Technology)
Nahm, Sahn (Department of Materials Science and Engineering, Korea University)
Kim, Seongwon (Engineering Ceramics Center, Korea Institute of Ceramic Engineering and Technology)
Publication Information
Journal of the Korean institute of surface engineering / v.49, no.6, 2016 , pp. 595-603 More about this Journal
Abstract
Rare-earth zirconates, including lanthanum zirconate and gadolinium zirconate, have been investigated as ones of the most promising candidates for next-generation thermal barrier coating (TBC) materials due to their excellent properties such as low thermal conductivity, chemical stability at high temperature and so on. In this study, TBCs with three compositions, in the $La_2O_3-Gd_2O_3-ZrO_2$ system with reduced rare-earth contents from $RE_2Zr_2O_7$ compositions, were fabricated by using suspension plasma spray with different suspension preparation methods. The phase formation, microstructure, and thermal properties of TBCs were examined. In particular, each coating exhibited single fluorite phase and a dense, vertically-separated microstructure. The potential of coatings with rare-earth zirconates for TBC applications was also discussed.
Keywords
Thermal barrier coatings (TBCs); Rare-earth zirconate; Suspension plasma spray; Phase formation; Thermal conductivity;
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Times Cited By KSCI : 6  (Citation Analysis)
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