Abstract
In order to comply with demand for high efficient gas turbines operating at higher temperatures, considerable amounts of research efforts have been performed with searching for the next-generation thermal barrier coatings (TBCs) with respect to coating materials as well as processing methods. In this study, thermal barrier coatings in the <TEX>$(La_{1-x}Gd_x)_2Zr_2O_7$</TEX> system, which is one of the most versatile materials replacing yttria-stabilized zirconia (YSZ), are fabricated by suspension plasma spray with suspension made of synthesized powders via solidstate reaction. Dense, <TEX>$100{\sim}400{\mu}m$</TEX> thick coatings of fluorite-phase zirconate with moderate amount of segmented microstructures are obtained by using suspension plasma spray. Phase formation and thermal diffusivity are characterized with coating compositions. The feasibility of <TEX>$(La_{1-x}Gd_x)_2Zr_2O_7$</TEX> coatings for TBC applications is also discussed.
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