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자료유형
학술저널
저자정보
Dong Soo Lee (Yonsei University) Dong Joon Min (Yonsei University)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.25 No.4
발행연도
2019.1
수록면
982 - 990 (9page)

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Nano-metallic nickel powders are highly-valued materials applied in energy, electronic devices and aerospace, which isknown to be produced by the gaseous phase reduction method of NiCl 2 . In the case of a gaseous reduction method, sizecontrol is diffi cult due to the agglomeration of nickel powders. Therefore, a method of producing highly-valued nickel nanopowdersfrom Ni(OH) 2 has been proposed. Considering the reduction behavior of bulk nickel oxide has been reported tofollow the topo-chemical model. However, reduction behavior of nano-particle is expected to be unknown state. It is necessaryto clarify the mechanism of nickel oxide nano-particle reduction. Therefore, in this study, the temperature dependence andparticle size dependence on the reduction behavior of from micro scale to nano scale particle was confi rmed through TGAexperiment. Also, the reduction mechanism of nickel oxide powder was also investigated based on kinetic considerationsusing the grain topo-chemical model. It was confi rmed that the reduction reaction of nickel oxide powder undergoes throughthe 2nd Avrami model and reduction rate can be expressed by function of temperature and particle size of the powder. Dueto the part of the diff usion, the particle size of the powder also aff ects the rate constant of the reduction reaction. g(x) = k ⋅ f(d) ⋅ t

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