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The Kinetics of Formation Of Nanocrystalline γ-Ni-Fe During Mechano-Chemical Synthesis

Published online by Cambridge University Press:  21 February 2011

P. Knorr ,
B.S. Kim  and
J.S. Lee
P. Knorr
Affiliation:
Dept. of Metallurgy and Materials Science, Hanyang University, Ansan, 425-791 Korea
B.S. Kim
Affiliation:
Dept. of Metallurgy and Materials Science, Hanyang University, Ansan, 425-791 Korea
J.S. Lee
Affiliation:
Dept. of Metallurgy and Materials Science, Hanyang University, Ansan, 425-791 Korea
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Abstract

An experimental study of the kinetics of the three partial processes involved in the mechano-chemical synthesis of nanocrystalline (nc) Ni-Fe is presented. These processes are the reduction of nc NiO, the reduction of nc Fe2O3, and the alloying of Ni and Fe to a γ-Ni-Fe solid solution. Fr the reaction rates of the reduction of nc NiO and nc Fe2O3 activation enthalpies of 82 kJ mol−1 and 47 kJ mol− were obtained. The progress of the overall synthesis was found to follow the sequence ‘NiO red. → Fe2O3 red. → γ-Ni-Fe form.’.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 577: Symposium H – Advanced Hard and Soft Magnetic Materials , 1999 , 409
Copyright
Copyright © Materials Research Society 1999

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References

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