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http://dx.doi.org/10.4150/KPMI.2011.18.6.568

Phase Evolution and Thermo-physical Properties of La2(Zr1-xHfx)2O7 Oxides for Thermal Barrier Coatings  

Kim, Seong-Won (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 of Materials Science)
Publication Information
Journal of Powder Materials / v.18, no.6, 2011 , pp. 568-574 More about this Journal
Abstract
As operating temperatures of engines or turbines continually increase for higher efficiency, significant amounts of researches have been focused on finding new materials, which would be alternatives to conventional yttria-stabilized zirconia (YSZ) for thermal barrier coatings (TBCs). In this study, phase evolution and thermo-physical properties of $La_2(Zr_{1-x}Hf_x)_2O_7$ pyrochlore systems are investigated for TBC applications. $La_2(Zr_{1-x}Hf_x)_2O_7$ systems are comprised by selecting $La^{3+}$ as A-site ions and $Zr^{4+}/Hf^{4+}$ as B-site ions in $A_2B_2O_7$ pyrochlore structures. For the developed phases in $La_2(Zr_{1-x}Hf_x)_2O_7$ compositions, thermo-physical properties such as thermal conductivity, thermal expansion coefficient are examined. The potential of these $La_2(Zr_{1-x}Hf_x)_2O_7$ compositions for TBC application is also discussed.
Keywords
Thermal barrier coatings; Rare-earth oxides; Pyrochlore; Thermo-physical properties;
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Times Cited By KSCI : 1  (Citation Analysis)
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