• 제목/요약/키워드: NiFe 분말

검색결과 229건 처리시간 0.024초

금속질산염을 이용한 Fe-Ni 나노분말의 제조 및 특성 (Synthesis and Properties of Fe-Ni Nano-sized Powders using Metal Nitrates)

  • 주민희;오승탁
    • 한국분말재료학회지
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    • 제16권3호
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    • pp.191-195
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    • 2009

  • The calcination and hydrogen-reduction behavior of Fe- and Ni-nitrate have been investigated. $Fe_2O_3$/NiO composite powders were prepared by chemical solution mixing of Fe- and Ni-nitrate and calcination at $350^{\circ}C$ for 2 h. The calcined powders were hydrogen-reduced at $350^{\circ}C$ for 30 min. The calcination and hydrogen-reduction behavior of Fe- and Ni-nitrate were analyzed by TG in air and hydrogen atmosphere, respectively. TG and XRD analysis for hydrogen-reduced powders revealed that the $Fe_2O_3$/NiO phase transformed to $FeNi_3$ phase at the temperature of $350^{\circ}$. The activation energy for the hydrogen reduction, evaluated by Kissinger method, was measured as 83.0 kJ/mol.

  • https://doi.org/10.4150/KPMI.2009.16.3.191 인용 PDF KSCI

산화물 수소환원에 의한 W-Ni-Fe 나노복합분말의 합성과 특성 (Synthesis and Characteristics of W-Ni-Fe Nanocomposite Powder by Hydrogen Reduction of Oxides)

  • 이창우;윤의식;이재성
    • 한국분말재료학회지
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    • 제8권1호
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    • pp.49-54
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    • 2001

  • The synthesis and characteristics of W-Ni-Fe nanocomposite powder by hydrogen reduction of ball milled W-Ni-Fe oxide mixture were investigated. The ball milled oxide mixture was prepared by high energy attrition milling of W blue powder, NiO and $Fe_2O_3$ for 1 h. The structure of the oxide mixture was characteristic of nano porous agglomerate composite powder consisting of nanoscale particles and pores which act as effective removal path of water vapor during hydrogen reduction process. The reduction experiment showed that the reduction reaction starts from NiO, followed by $Fe_2O_3$ and finally W oxide. It was also found that during the reduction process rapid alloying of Ni-Fe yielded the formation of $\gamma$-Ni-Fe. After reduction at 80$0^{\circ}C$ for 1 h, the nano-composite powder of W-4.57Ni-2.34Fe comprising W and $\gamma$-Ni-Fe phases was produced, of which grain size was35nm for W and 87 nm for $\gamma$-Ni-Fe, respectively. Sinterability of the W heavy alloy nanopowder showing full density and sound microstructure under the condition of 147$0^{\circ}C$/20 min is thought to be suitable for raw material for powder injection molding of tungsten heavy alloy.

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