Korean Institute of Surface Engineering

pISSN : 1225-8024 | eISSN : 3399-8403

공학

한국표면공학회지 (49권6호 604-611)

Phase Formation and Thermal Diffusivity of Thermal Barrier Coatings of La2Zr2O7, (La0.5Gd0.5)2Zr2O7, Gd2Zr2O7 Fabricated by Suspension Plasma Spray

서스펜션 플라즈마 용사법으로 제조한 La2Zr2O7, (La0.5Gd0.5)2Zr2O7, Gd2Zr2O7 열차폐코팅의 상형성과 열전도 특성

김선주;이성민;오윤석;김형태;장병국;김성원;
Kim, Sun-Joo;Lee, Sung-Min;Oh, Yoon-Suk;Kim, Hyung-Tae;Jang, Byung-Koog;Kim, Seongwon;

한국세라믹기술원 이천분원 엔지니어링세라믹센터;물질재료연구기구 구조재료연구센터;
Engineering Ceramics Center, Korea Institute of Ceramic Engineering and Technology;Research Center for Structural Materials, National Institute for Materials;

DOI : 10.5695/JKISE.2016.49.6.604

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 $(La_{1-x}Gd_x)_2Zr_2O_7$ 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, $100{sim}400{mu}m$ 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 $(La_{1-x}Gd_x)_2Zr_2O_7$ coatings for TBC applications is also discussed.

Keywords

Thermal barrier coatings (TBCs);Lanthanum/gadolinium zirconate;Suspension plasma spray;Phase formation;Thermal property;