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 950oC 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 Al2O3 upon the addition of Si oxide. Si oxides promote the formation of Al2O3 and Cr oxide at the grain boundary, and obstruct neck formation and the growth of Fecralloy particles to ensure stable electrical resistivity.

• 박진우(경상대학교 나노·신소재 공학부) | Jin-Woo Park
• 옥진욱(경상대학교 나노·신소재 공학부) | Jin-Uk Ok
• 정우영(경상대학교 나노·신소재 공학부) | Woo-young Jung
• 박동규(경상대학교 링크 사업단) | Dong-kyu Park
• 안인섭(경상대학교 나노·신소재 공학부, 경상대학교 그린에너지 융합연구소) | In-Shup Ahn