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http://dx.doi.org/10.5695/JKISE.2014.47.6.316

Structure and Thermal Conductivity of Thermal Barrier Coatings in Lanthanum/Gadolinium Zirconate System Fabricated via Suspension Plasma Spray  

Kwon, Chang-Sup (Engineering Ceramic Team, Korea Institute of Ceramic Engineering and Technology)
Lee, Sung-Min (Engineering Ceramic Team, Korea Institute of Ceramic Engineering and Technology)
Oh, Yoon-Suk (Engineering Ceramic Team, Korea Institute of Ceramic Engineering and Technology)
Kim, Hyung-Tae (Engineering Ceramic Team, Korea Institute of Ceramic Engineering and Technology)
Jang, Byung-Koog (High Temperature Materials Unit, National Institute for Materials Science)
Kim, Seongwon (Engineering Ceramic Team, Korea Institute of Ceramic Engineering and Technology)
Publication Information
Journal of the Korean institute of surface engineering / v.47, no.6, 2014 , pp. 316-322 More about this Journal
Abstract
With increase in demand for higher operating temperatures of gas turbines, extensive research efforts have been carried out to enhance the performance of thermal barrier coatings (TBCs) in the field of coating processing as well as materials. In this study, thermal barrier coatings in lanthanum/gadolinium zirconate system, which is one of the most promising candidates for replacing yttira-stabilized zirconia (YSZ) in thermal barrier coating applications, are fabricated via suspension plasma spray. Dense, $300{\sim}400{\mu}m$ thick coatings of fluoritephase zirconate with modest amount of segmented microstructures are obtained by using suspension plasma spray with suspensions of planetary-milled mixture between lanthanum and/or gadolinium oxide and nano zirconia. These coatings exhibit thermal conductivities of 1.6 ~ 1.7 W/mK at $1000^{\circ}C$, which is relatively lower than that of YSZ.
Keywords
Thermal barrier coatings; Suspension plasma spray; Rare-earth zirconate; Phase formation; Thermal conductivity;
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