서스펜션 플라즈마 용사법으로 제조한 La2Zr2O7, (La0.5Gd0.5)2Zr2O7, Gd2Zr2O7 열차폐코팅의 상형성과 열전도 특성
Phase Formation and Thermal Diffusivity of Thermal Barrier Coatings of La2Zr2O7, (La0.5Gd0.5)2Zr2O7, Gd2Zr2O7 Fabricated by Suspension Plasma Spray
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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 (La1-xGdx)2Zr2O7 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, 100~400 μm 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 (La1-xGdx)2Zr2O7 coatings for TBC applications is also discussed.
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 (La1-xGdx)2Zr2O7 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, 100~400 μm 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 (La1-xGdx)2Zr2O7 coatings for TBC applications is also discussed.
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