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J. Korean Ceram. Soc. > Volume 50(5); 2013 > Article
Journal of the Korean Ceramic Society 2013;50(5): 326.
doi: https://doi.org/10.4191/kcers.2013.50.5.326
분무건조 및 대기 플라즈마 용사에 의한 지르코니아 열차폐 코팅재의 제조 및 평가
김철, 허용석, 김태우, 이기성
국민대학교 기계시스템공학부 기계설계전공
Fabrication and Characterization of Zirconia Thermal Barrier Coatings by Spray Drying and Atmospheric Plasma Spraying
Chul Kim, Yong Suk Heo, Tae Woo Kim, Kee Sung Lee
School of Mechanical Systems Engineering, Kookmin University
ABSTRACT
In this study, we prepared yttria stabilized zirconia granules for thermal barrier coatings using a spray drying process. First, we characterized the properties of granules such as flow rate and packing density for utilizing the air plasma spray process. The flow rate and packing density data showed 0.732 g/sec and 2.14 $g/cm^3$, respectively, when we used larger and denser particles, which are better than hollow granules or smaller spherical granules. Second, we chose larger, spherical granules fabricated in alcohol solvent as starting powders and sprayed it on the bondcoat/nimonic alloy by an atmospheric plasma spray process varying the process parameters, the feeding rate, gun speed and spray distance. Finally, we evaluated representative thermal and mechanical characteristics. The thermal expansion coefficients of the coatings were $11{sim}12.7{times}10^{-6}/^{circ}C$ and the indentation stress measured was 2.5 GPa at 0.15 of indentation strain.
Key words: Zirconia, Thermal barrier coatings, Spray drying, Air plasma spray
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