Korean Institute of Surface Engineering

pISSN : 1225-8024 | eISSN : 3399-8403

공학

한국표면공학회지 (49권6호 595-603)

Fabrication and Characteristics of Thermal Barrier Coatings in the La2O3-Gd2O3-ZrO2 System by Using Suspension Plasma Spray with Different Suspension Preparations

서스펜션의 준비방법에 따른 서스펜션 플라즈마 용사를 이용한 La2O3-Gd2O3-ZrO2 계 열차폐코팅의 제조와 특성

이소율;이성민;오윤석;김형태;남산;김성원;
Lee, Soyul;Lee, Sung-Min;Oh, Yoon-Suk;Kim, Hyung-Tae;Nahm, Sahn;Kim, Seongwon;

한국세라믹기술원 이천분원 엔지니어링세라믹센터;고려대학교 신소재공학과;
Engineering Ceramics Center, Korea Institute of Ceramic Engineering and Technology;Department of Materials Science and Engineering, Korea University;

DOI : 10.5695/JKISE.2016.49.6.595

Abstract

Rare-earth zirconates, including lanthanum zirconate and gadolinium zirconate, have been investigated as ones of the most promising candidates for next-generation thermal barrier coating (TBC) materials due to their excellent properties such as low thermal conductivity, chemical stability at high temperature and so on. In this study, TBCs with three compositions, in the $La_2O_3-Gd_2O_3-ZrO_2$ system with reduced rare-earth contents from $RE_2Zr_2O_7$ compositions, were fabricated by using suspension plasma spray with different suspension preparation methods. The phase formation, microstructure, and thermal properties of TBCs were examined. In particular, each coating exhibited single fluorite phase and a dense, vertically-separated microstructure. The potential of coatings with rare-earth zirconates for TBC applications was also discussed.

Keywords

Thermal barrier coatings (TBCs);Rare-earth zirconate;Suspension plasma spray;Phase formation;Thermal conductivity;