Effect of Oxide Catalyst on Heterogeneous Nucleation in Fe-10mass%Ni Alloys
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概要
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In order to elucidate the nature of heterogeneous nucleation, a differential scanning calorimetry (DSC) thermal analysis of Fe–10mass%Ni alloys containing oxide catalysts was conducted. For all oxide catalysts, the maximum frequency in the particle-size distributions diminishes and the modal value increases with a decrease in the amount of deoxidizers or with an increase in the elapsed time after deoxidizer addition. That is, the number of smaller particles decreases, while the number of larger particles increases. In proportion to this change of the particle-size distribution, the critical undercooling (ΔT) increases. For the same amount of deoxidizers and the same elapsed time, the value of ΔT for the primary crystal of the γ phase is smaller in the order of MgO, ZrO2, Al2O3, and CaO–Al2O3. Oxide catalysts grow by Ostwald ripening, therefore the growth can be controlled by the diffusion of oxygen. Thus, the decrease of the soluble oxygen content by strong deoxidizers results in the inhibition of particle growth.
- 2006-06-15
著者
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Jönsson Pär
Division of Applied Process Metallurgy, Royal Institute of Technology
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Suito Hideaki
Tohoku Univ. Miyagiken Jpn
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Suito Hideaki
Institute Of Multidisciplinary Research For Advanced Materials Tohoku University
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Suito Hideaki
Institute For Advanced Materials Processing Tohoku University
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NAKAJIMA Keiji
Corporate Research & Development Laboratories, Sumitomo Metal Industries, Ltd.
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Suito Hideaki
Institute Of Multidisciplinary Research For Advanced Materials (imram) Tohoku University
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OHTA Hiroki
Institute for Multidisciplinary Research for Advanced Materials, Tohoku University
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Joensson Paer
Royal Inst. Of Technol. (kth) Stockholm Swe
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Jonsson Par
Division Of Applied Process Metallurgy Kth
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Ohta Hiroki
Institute For Multidisciplinary Research For Advanced Materials Tohoku University
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Jonsson Par
Division Of Applied Process Metallurgy Department Of Materials Science And Engineering Royal Institu
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Nakajima Keiji
Div. Of Applied Process Metallurgy Dep. Of Materials Sci. And Engineering Royal Inst. Of Technol. (k
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Nakajima Keiji
Corporate Research & Development Laboratories Sumitomo Metals Industries Ltd.
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Ohta Hiroki
Iron And Steel Res. Laboratories Kakogawa Works Kobe Steel Ltd.
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Suito Hideaki
Professor Emeritus Tohoku University
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Ohta Hiroki
Institute Of Multidisciplinary Research For Advanced Materials (imram) Tohoku University
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Ohta Hiroki
Institute For Advanced Materials Processing Tohoku University
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Suito Hideaki
Institute For Advanced Materials Processing Tohoku Unibersity
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