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http://dx.doi.org/10.4191/KCERS.2005.42.1.043

Indentation of YSZ/Al2O3 Layered Systems Prepared by Nano-Coating  

Kim, Sang-Kyum (School of Mechanical and Automotive Engineering, Kookmin University)
Kim, Tae-Woo (School of Mechanical and Automotive Engineering, Kookmin University)
Kim, Chul (Energy Materials Research Center, Korea Institute of Energy Research)
Shin, Tae-Ho (Energy Materials Research Center, Korea Institute of Energy Research)
Han, In-Sub (Energy Materials Research Center, Korea Institute of Energy Research)
Woo, Sang-Kuk (Energy Materials Research Center, Korea Institute of Energy Research)
Lee, Kee-Sung (School of Mechanical and Automotive Engineering, Kookmin University)
Publication Information
Journal of the Korean Ceramic Society / v.42, no.1, 2005 , pp. 43-49 More about this Journal
Abstract
YSZ layer containing nano-sized particles has been deposited on the commercial A1203 substrate by Electron Beam Physical Vapor Deposition (EB-PVD). The role of coating rnjcrostructures of YSZ to indentation damage is studied. The different coating microsouctures are prepared by varying the substrate temperatures from $600^{circ}C$ to $800^{circ}C$ during the deposition. Microhardness test and Hertzian indentation are conducted on the $YSZ/Al_{2}O_{3}$ layered systems. The damage and flilure behaviors have been investigated according to the effect of microstructures and indentation loads. With increasing the substrate temperature during EB-PVD, the overall grain sizes are coarser and more faceted, which microsoucture ultimately influences on the indentation behavior, thus, YSZ/Al_{2}O_{3}$ layered system prepared at the substrate temperature of $800^{circ}C$ shows relatively higher damage tolerance.
Keywords
Nano-coating; YSZ; EB-PVD; Indentation; Microstructure;
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