Nucleation and grain growth model for reduction of hematite to magnetite.

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Hydrothermal phase transformation of hematite to magnetite

Different phases of iron oxide were obtained by hydrothermal treatment of ferric solution at 200°C with the addition of either KOH, ethylenediamine (EDA), or KOH and EDA into the reaction system. As usually observed, the α-Fe2O3 hexagonal plates and hexagonal bipyramids were obtained for reaction with KOH and EDA, respectively. When both KOH and EDA were added into the reaction system, we obser...

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Abstract. In materials that possess a well developed sub-grain structure in the deformed state, nucleation can be considered as a type of abnormal (sub-)grain growth. The critical condition for this type of nucleation was investigated with a Monte Carlo code. The findings were as follows. (1) The nucleus size is a key factor for survival of an embryo. An embryo with a size below a critical valu...

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Self-Similar Solutions to a Kinetic Model for Grain Growth

We prove the existence of self-similar solutions to the Fradkov model for twodimensional grain growth, which consists of an infinite number of nonlocally coupled transport equations for the number densities of grains with given area and number of neighbours (topological class). For the proof we introduce a finite maximal topological class and study an appropriate upwind-discretization of the ti...

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ژورنال

عنوان ژورنال: Transactions of the Iron and Steel Institute of Japan

سال: 1988

ISSN: 0021-1583,1881-1183

DOI: 10.2355/isijinternational1966.28.1006