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http://dx.doi.org/10.3740/MRSK.2002.12.3.220

Characterization of Oxide Scales Formed on Ni3Al-7.8%Cr-1.3%Zr-0.8%Mo-0.025%B  

Kim, Gi-Yeong (Center for Advanced Plasma Surface Technology, Sungkyunkwan Uiversity)
Lee, Dong-Bok (Center for Advanced Plasma Surface Technology, Sungkyunkwan Uiversity)
Publication Information
Korean Journal of Materials Research / v.12, no.3, 2002 , pp. 220-224 More about this Journal
Abstract
The oxide scales formed on $Ni_3Al$-7.8%Cr-1.3%Zr-0.8%Mo-0.025%B after oxidation at 900, 1000 and 110$0^{\circ}C$ in air were studied using XRD, SEM, EPMA and TEM. The oxide scales consisted primarily of $NiO,\; NiAl_2O_4,\;{\alpha}-Al_2O_3,\; monoclinic-ZrO_2,\; and \;tetragonal-ZrO_2$. The outer layer of the oxide scale was rich in Ni-oxides, whereas the internal oxide stringers were rich in Al-oxides and $ZrO_2$. Within the above oxide scales, Cr and Mo tended to exist as dissolved ions.
Keywords
$Ni_3$Al; $\alpha$-${A1_2}{O_3}$; $ZrO_2$; chromium; molybdenum; boron; oxidation;
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