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http://dx.doi.org/10.3740/MRSK.2003.13.1.036

Structural and Electrical Properties of the Y-Cr Bilayer Deposited on Fe-l6Cr Ferritic Alloy after Heat Treatment at 800℃  

Lee, Yong-Jin (Department of Materials Science and Engineering, Hanyang University)
Kim, Sang-Woo (Nano-Materials Research Center, KIST)
Kim, Gyeung-Ho (Nano-Materials Research Center, KIST)
Lee, Jong-Ho (Nano-Materials Research Center, KIST)
Ahn, Jin-Ho (Department of Materials Science and Engineering, Hanyang University)
Publication Information
Korean Journal of Materials Research / v.13, no.1, 2003 , pp. 36-42 More about this Journal
Abstract
The oxidation behaviors of Y-Cr bilayer deposited on ferritic steel by magnetron-sputtering for application of the Fe-Cr alloys as interconnectors of planar-type solid oxide fuel cells (SOFCs) were studied. After oxidation at $800^{\circ}C$ for 40 hours, the major phase of $Y_2$$O_3$and the minor phase of $YCrO_3$, $Mn_{1.5}$ $Cr_{1.5}$ $O_4$and Cr$_2$SiO$_4$were formed in the Y/Cr bilayered samples, while the major phase of Cr$_2$O$_3$and the minor phase of $Y_2$$O_3$were formed as the major phase in the Cr/Y bilayered samples. The Log(ASR/T) that expresses electric resistance of the Y/Cr coated specimen with nonconducting $_Y2$$O_3$oxide showed high value of -2.80 Ω$\textrm{cm}^2$$K^{-1}$ / and that of the Cr/Y coated specimen with conducting $Cr_2$$O_3$oxide appeared to be -4.11 Ω$\textrm{cm}^2$$^{K}$ . The electric resistance of the Y/Cr coated specimen was largely increased due to the formation of high resistance oxide scales. However, the Cr/Y coated specimen did not show any increase in the electric resistance and had the long-term stability of oxidation because there was no formation of the secondary phases with low conductivity.
Keywords
oxidation behavior; ferritic steel; electrical conductivity; Y-Cr Bilayer;
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