| 简介 |
PROBLEM TO BE SOLVED : To provide a technology for stably manufacturing iron-nitride magnetic power, with "sintering prevention" and "acceleration of nitriding" made compatible are realized.
SOLUTION : In an iron-nitride magnetic powder which consists of particles that are mainly composed of a Fe16N2 phase and whose average particle size is 20 nm or smaller, TAP density is 0.75 g/cm3 or below and a nitriding rate calculated from an X-ray diffraction pattern is 70 to 100%. 4 to 15 mol% of rare earth elements (Y is treated as rare earth element) are contained in the iron-nitride magnetic powder as a sintering inhibitor by a molar ratio, with respect to Fe. The iron-nitride magnetic powder having an above characteristic is manufactured, by using a solution of hydrogen peroxide as oxidant for oxy-iron hydroxide growth process and fully adding the rare earth elements in a process for synthesizing oxy-iron hydroxide (material powder).
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