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http://dx.doi.org/10.4191/kcers.2016.53.1.81

Effect of Substrate Rotation on the Phase Evolution and Microstructure of 8YSZ Coatings Fabricated by EB-PVD  

Park, Chanyoung (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology)
Choi, Seona (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology)
Chae, Jungmin (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology)
Kim, Seongwon (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology)
Kim, Hyungtae (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology)
Oh, Yoon-Suk (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology)
Publication Information
Journal of the Korean Ceramic Society / v.53, no.1, 2016 , pp. 81-86 More about this Journal
Abstract
The effect of substrate rotation speed on the phase forming behavior and microstructural variation of 8 wt% yttria ($Y_2O_3$) stabilized $ZrO_2$ (8YSZ) coatings as a thermal barrier coating has been investigated. 8YSZ coatings with $100{\sim}200{\mu}m$ thickness were deposited by electron beam-physical vapor deposition onto a super alloy (Ni-Cr-Co-Al) substrate with a bond coating (NiCo-CrAlY). The width of the columnar grains of the 8YSZ coatings increased with increasing substrate rotation speed from 1 to 30 rpm at a substrate temperature range of $900{\sim}950^{\circ}C$. In spite of the different growth behaviors of coatings with different substrate rotation speeds, the phases of each coating were not changed remarkably. Even after post heat treatments with various conditions of the coated specimens fabricated at 20 rpm, only a change of color was noticeable, without any remarkable change in the phase or microstructure.
Keywords
Thermal barrier coating; 8YSZ; Substrate rotation; Columnar structure; EB-PVD;
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