Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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The Effect of SiO2 addition on Oxidation and Electrical Resistance Stability at High-temperature of P/M Fecralloy Compact

P/M Fecralloy 성형체의 고온산화 및 전기저항 안정성에 미치는 SiO2 첨가 효과

  • 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)
  • 박진우 (경상대학교 나노.신소재 공학부) ;
  • 옥진욱 (경상대학교 나노.신소재 공학부) ;
  • 정우영 (경상대학교 나노.신소재 공학부) ;
  • 박동규 (경상대학교 링크 사업단) ;
  • 안인섭 (경상대학교 나노.신소재 공학부)
  • Received : 2017.06.20
  • Accepted : 2017.08.09
  • Published : 2017.08.28
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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.

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References

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