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http://dx.doi.org/10.4150/KPMI.2010.17.2.148

Phase Evolution and Thermo-physical Properties of Rare-earth Oxides for Thermal Barrier Systems  

Shim, Byung-Chul (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology)
Kwak, Kil-Ho (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 (Nano Ceramics Center, National Institute of Materials Science)
Kim, Seong-Won (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology)
Publication Information
Journal of Powder Materials / v.17, no.2, 2010 , pp. 148-153 More about this Journal
Abstract
Thermal barrier systems have been widely investigated over the past decades, in order to enhance reliability and efficiency of gas turbines at higher temperatures. Yttria-stabilized zirconia (YSZ) is one of the most leading materials as the thermal barriers due to its low thermal conductivity, thermodynamic stability, and thermal compatibility with metal substrates. In this work, rare-earth oxides with pyrochlore phases for thermal barrier systems were investigated. Pyrochlore phases were successfully formed via solid-state reactions started from rare-earth oxide powders. For the heat-treated samples, thermo-physical properties were examined. These rare-oxide oxides showed thermal expansion of $9{\sim}12{\times}10^{-6}/K$ and thermal conductivity of 1.2~2.4 W/mK, which is comparable with the thermal properties of YSZ.
Keywords
Thermal barrier systems; Rare-earth oxides; Pyrochlore; Thermo-physical properties;
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