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http://dx.doi.org/10.4150/KPMI.2017.24.4.292

The Effect of SiO2 addition on Oxidation and Electrical Resistance Stability at High-temperature of P/M Fecralloy Compact  

Park, Jin-Woo (School of Nano and Advanced Materials Science & Engineering, Gyeongsang National University)
Ok, Jin-Uk (School of Nano and Advanced Materials Science & Engineering, Gyeongsang National University)
Jung, Woo-young (School of Nano and Advanced Materials Science & Engineering, Gyeongsang National University)
Park, Dong-kyu (LINC, Gyeongsang National University)
Ahn, In-Shup (School of Nano and Advanced Materials Science & Engineering, Gyeongsang National University)
Publication Information
Journal of Powder Materials / v.24, no.4, 2017 , pp. 292-297 More about this Journal
Abstract
A metallic oxide layer of a heat-resistant element contributes to the high-temperature oxidation resistance by delaying the oxidation and has a positive effect on the increase in electrical resistivity. In this study, green compacts of Fecralloy powder mixed with amorphous and crystalline silica are oxidized at $950^{\circ}C$ for up to 210 h in order to evaluate the effect of metal oxide on the oxidation and electrical resistivity. The weight change ratio increases as per a parabolic law, and the increase is larger than that observed for Fecralloy owing to the formation of Fe-Si, Fe-Cr composite oxide, and $Al_2O_3$ upon the addition of Si oxide. Si oxides promote the formation of $Al_2O_3$ and Cr oxide at the grain boundary, and obstruct neck formation and the growth of Fecralloy particles to ensure stable electrical resistivity.
Keywords
Fecralloy; Oxidation resistance; Electrical resistivity; Metallic oxide;
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Times Cited By KSCI : 2  (Citation Analysis)
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