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http://dx.doi.org/10.4191/kcers.2016.53.6.628

Effect of the Raw Material and Coating Process Conditions on the Densification of 8 wt% Y2O3-ZrO2 Thermal Barrier Coating by Atmospheric Plasma Spray  

Oh, Yoon-Suk (Engineering Ceramic Center, Korea Institute of Ceramic & Engineering Technology)
Kim, Seong-Won (Engineering Ceramic Center, Korea Institute of Ceramic & Engineering Technology)
Lee, Sung-Min (Engineering Ceramic Center, Korea Institute of Ceramic & Engineering Technology)
Kim, Hyung-Tae (Engineering Ceramic Center, Korea Institute of Ceramic & Engineering Technology)
Kim, Min-Sik (R&D Center, Sewon Hardfacing Co. LTD.)
Moon, Heung-Soo (R&D Center, Sewon Hardfacing Co. LTD.)
Publication Information
Journal of the Korean Ceramic Society / v.53, no.6, 2016 , pp. 628-634 More about this Journal
Abstract
The 8 wt% yttria($Y_2O_3$) stabilized zirconia ($ZrO_2$), 8YSZ, a typical thermal barrier coating (TBC) for turbine systems, was fabricated under different starting powder conditions and coating parameters by atmospheric plasma spray (APS) coating process. Four different starting powders were prepared by conventional spray dry method with different additive and process parameter conditions. As a result, large- and small-size spherical-type particles and Donut-type particles were obtained. Dense structure of 8YSZ coating was produced when small size spherical-type or Donut-type particles were used. On the other hand, 8YSZ coating with a porous structure was formed from large-size spherical-type particles. Furthermore, a segmented coating structure with vertical cracks was observed after post heat treatment on the surface of dense structured coating by argon plasma flame at an appropriate gun distance and power condition.
Keywords
Yttria-stabilized zirconia (YSZ); Thermal barrier coating (TBC); Atmospheric plasma spray (APS); Spherical solid particle; Segmented microstructure;
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Times Cited By KSCI : 2  (Citation Analysis)
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