PROCESS FOR PRODUCING FERROMAGNETIC IRON NITRIDE PARTICLES, ANISOTROPIC MAGNET, BONDED MAGNET AND COMPACTED MAGNET
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United States of America Patent
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Issued Date -
Oct 2, 2014
app pub date -
Sep 20, 2012
filing date -
Sep 22, 2011
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Abandoned
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Abstract
The present invention provides ferromagnetic iron nitride particles, in particular, in the form of fine particles, and a process for producing the ferromagnetic iron nitride particles. The present invention relates to a process for producing ferromagnetic iron nitride particles, comprising the steps of mixing metallic iron obtained by mixing at least one compound selected from the group consisting of a metal hydride, a metal halide and a metal borohydride with an iron compound, and then subjecting the obtained mixture to heat treatment, with a nitrogen-containing compound; and then subjecting the resulting mixture to heat treatment, in which a reduction step and a nitridation step of the iron compound are conducted in the same step, and the at least one compound selected from the group consisting of a metal hydride, a metal halide and a metal borohydride is used as a reducing agent in the reduction step, whereas the nitrogen-containing compound is used as a nitrogen source in the nitridation step.
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