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심병철,곽길호,이성민,오윤석,김형태,장병국,김성원,Shim, Byung-Chul,Kwak, Kil-Ho,Lee, Sung-Min,Oh, Yoon-Suk,Kim, Hyung-Tae,Jang, Byung-Koog,Kim, Seong-Won 한국분말야금학회 2010 한국분말재료학회지 (KPMI) Vol.17 No.2
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.