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http://dx.doi.org/10.4150/KPMI.2012.19.6.429

Phase Evolution and Thermal Conductivities of (La1-xGdx)2Zr2O7 Oxides for Thermal Barrier Coatings  

Kwon, Chang-Sup (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology)
Lee, Sung-Min (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology)
Oh, Yoon-Suk (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology)
Kim, Hyung-Tae (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology)
Jang, Byung-Koog (High Temperature Materials Unit, National Institute for Materials Science)
Kim, Seong Won (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology)
Publication Information
Journal of Powder Materials / v.19, no.6, 2012 , pp. 429-434 More about this Journal
Abstract
With increase in operating temperature of gas turbine for higher efficiency, it is necessary to find new materials of TBC for replacement of YSZ. Among candidate materials for future TBCs, zirconate-based oxides with pyrochlore and fluorite are prevailing ones. In this study, phase structure and thermal conductivities of $(La_{1-x}Gd_x)_2Zr_2O_7$ oxide system are investigated. $(La_{1-x}Gd_x)_2Zr_2O_7$ system are comprised by selecting $La^{3+}/Gd^{3+}$ as A-site ions and $Zr^{4+}$ as B-site ion in $A_2B_2O_7$ pyrochlore structures. With powder mixture from each oxide, $(La_{1-x}Gd_x)_2Zr_2O_7$ oxides are fabricated via solid-state reaction at $1600^{\circ}C$. Either pyrochlore or fluorite or mixture of both appears after heat treatment. For the developed phases along $(La_{1-x}Gd_x)_2Zr_2O_7$ compositions, thermal conductivities are examined, with which the potential of $(La_{1-x}Gd_x)_2Zr_2O_7$ compositions for TBC application is also discussed.
Keywords
Thermal barrier coatings; Rare-earth oxides; Pyrochlore-fluorite; Thermal conductivities;
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Times Cited By KSCI : 2  (Citation Analysis)
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