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http://dx.doi.org/10.4191/KCERS.2007.44.7.387

High Temperature Thermal Conductivities in La2Ce2O7−Gd2Ce2O7−Y2Ce2O7 Pyrochlore System for Thermal Barrier Coatings  

Yoon, So-Young (Structural Ceramics Division, KICET)
Lee, Sung-Min (Structural Ceramics Division, KICET)
Shim, Kwang-Bo (Division of Advanced Materials Science and Engineering, Hanyang University)
Kim, Hyung-Tae (Structural Ceramics Division, KICET)
Publication Information
Journal of the Korean Ceramic Society / v.44, no.7, 2007 , pp. 387-392 More about this Journal
Abstract
Thermal conductivities in $La_2Ce_2O_7-Gd_2Ce_2O_7-Y_2Ce_2O_7$ ternary system have been investigated. Pyrochlore phases formed at all ternary compositions and their sinterbilities were decreased with La addition. Thermal conductivities showed a minimum value at $La_2Ce_2O_7$ with moderate increases as $Y^{3+}$ and $Gd^{3+}$ ions replaced $La^{3+}$. Thermal expansion anomaly observed in $La_2Ce_2O_7$, which might be detrimental to TBC application, were suppressed by $Y^{3+}$ and $Gd^{3+}$ additions, with resultant thermal conductivities, $1.3{\sim}1.5 W/mK$ at $1000^{\circ}C$.
Keywords
Thermal barrier coating; High temperature thermal conductivity; Pyrochlore; Thermal Expansion Coefficient;
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