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http://dx.doi.org/10.4313/JKEM.2019.32.2.174

Synthesis of Yttria Stabilized Zirconia Powder with Rare Earth Using Oxalate Method  

Nam, Jeong Sic (Optic & Electrnic Components Materials Center, Korea Institute of Ceramic Engineering and Technology)
Lee, Ji-Sun (Optic & Electrnic Components Materials Center, Korea Institute of Ceramic Engineering and Technology)
Lee, Young-Jin (Optic & Electrnic Components Materials Center, Korea Institute of Ceramic Engineering and Technology)
Jeon, Dae-Woo (Optic & Electrnic Components Materials Center, Korea Institute of Ceramic Engineering and Technology)
Kim, Sun-Woog (Optic & Electrnic Components Materials Center, Korea Institute of Ceramic Engineering and Technology)
Ra, Yong-Ho (Optic & Electrnic Components Materials Center, Korea Institute of Ceramic Engineering and Technology)
Kim, Sae-Hoon (Department of Ceramic Engineering, Gangneung Wonju National University)
Kim, Jin-Ho (Optic & Electrnic Components Materials Center, Korea Institute of Ceramic Engineering and Technology)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.32, no.2, 2019 , pp. 174-177 More about this Journal
Abstract
The traditional yttria-stabilized zirconia (YSZ) used in thermal barrier coatings has a limited operating temperature owing to densification and volume changes at high temperatures. A $(La_{1-x}Y_x)_2Zr_2O_7$ sintered compound was prepared by the co-precipitation and oxalate methods, by adding lanthanum zirconate to yttria. The thermal properties and crystallinity obtained by the two different methods were compared. Both methods yielded pyrochlore structures, and the oxalate method confirmed phases at low temperatures. The thermal conductivity of the sintered bulk prepared by co-precipitation was 0.93 W/mK, while that prepared by the oxalate method was 0.85 W/mK. These values are superior to that of 4YSZ at $1,000^{\circ}C$, which is widely used in industries.
Keywords
Rare-earth zirconate; Pyrochlore; YSZ;
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