J. Korean Ceram. Soc. > Volume 51(6); 2014 > Article
 Journal of the Korean Ceramic Society 2014;51(6): 598. doi: https://doi.org/10.4191/kcers.2014.51.6.598
 서스펜션 플라즈마 용사법을 이용한 7.5 wt% Y2O3-ZrO2 열차폐코팅 제조 및 평가 이원준, 오윤석, 이성민, 김형태, 임대순1, 김성원 한국세라믹기술원 이천분원 엔지니어링세라믹팀1고려대학교 신소재공학과 Fabrication and Characterization of 7.5 wt% Y2O3-ZrO2 Thermal Barrier Coatings Deposited by Suspension Plasma Spray Won-Jun Lee, Yoon-Suk Oh, Sung-Min Lee, Hyung-Tae Kim, Dae-Soon Lim1, Seongwon Kim Engineering Ceramic Team, Korea Institute of Ceramic Engineering & Technology1Department of Materials Science and Engineering, Korea University ABSTRACT Considerable research efforts have been explored attempting to enhance the thermal durability of thermal barrier coatings (TBCs) at the high operating temperatures of gas turbines. In this study, the suspension plasma spray (SPS) process was applied to produce TBCs with a segmented structure by using an yttria-stabilized zirconia (YSZ) suspension. Four different experiment sets were carried out by controlling the ratio between surface roughness of the bond coat and feed stock size ($R_a/D_{50}$) in order to examine the effect of $R_a/D_{50}$ ratio on the microstructure of SPS-prepared coatings. When the $R_a/D_{50}$ had a high value of 11.8, a deposited thick coating turned out to have a cone-type columnar microstructure. In contrast, at the low $R_a/D_{50}$ values of 2.9 and 0.18, a deposited thick coating appeared to have a dense, vertically-cracked microstructure. However, with the very low $R_a/D_{50}$ value of 0.05 the coating was delaminated. Key words: Yttria-stabilized zirconia(YSZ), Thermal barrier coatings, Suspension plasma spray, Segmented microstructure
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