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http://dx.doi.org/10.5695/JKISE.2015.48.6.315

Fabrication and Characterization of La2Zr2O7/YSZ Double-Ceramic-Layer Thermal Barrier Coatings Fabricated by Suspension Plasma Spray  

Kwon, Chang-Sup (Engineering Ceramic Team, Korea Institute of Ceramic Engineering and Technology)
Lee, Sujin (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.48, no.6, 2015 , pp. 315-321 More about this Journal
Abstract
Rare-earth zirconates, such as $La_2Zr_2O_7$ and $Gd_2Zr_2O_7$, have been investigated as one of the candidates for replacing conventional yttria-stabilized zirconia (YSZ) for thermal barrier coating (TBC) applications at higher turbine inlet temperatures. In this study, double-ceramic-layer (DCL) TBCs of YSZ 1st layer and $La_2Zr_2O_7$ top coat layer are fabricated by suspension plasma spray with serial liquid feeders. Microstructures, hardness profiles, and thermal durability of DCL-TBCs are also characterized. Fabricated DCL-TBCs of YSZ/$La_2Zr_2O_7$ exhibit excellent properties, such as adhesion strength (>25 MPa) and electrical thermal fatigue (~1429 cycles), which are comparable with TBCs fabricated by atmospheric plasma spray.
Keywords
Thermal barrier coatings (TBCs); Double ceramic layer; Rare-earth zirconate; Suspension plasma spray;
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