서스펜션의 준비방법에 따른 서스펜션 플라즈마 용사를 이용한 La2O3-Gd2O3-ZrO2 계 열차폐코팅의 제조와 특성
Fabrication and Characteristics of Thermal Barrier Coatings in the La2O3-Gd2O3-ZrO2 System by Using Suspension Plasma Spray with Different Suspension Preparations
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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 La2O3-Gd2O3-ZrO2 system with reduced rare-earth contents from RE2Zr2O7 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.
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 La2O3-Gd2O3-ZrO2 system with reduced rare-earth contents from RE2Zr2O7 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.
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