| 简介 |
PROBLEM TO BE SOLVED : To provide a manufacturing method of a magnet capable of suppressing cost increase and obtaining high remanent magnetic flux density without using a bond and the magnet.
SOLUTION : The manufacturing method of a magnet includes : a step S1 for preparing a magnetic powder 1 of a hard magnetic body composed of one or more kinds of Fe-N based compound and R-Fe-N based compound (R : a rare earth element); a step S4 for obtaining a primary molding 5 by pressure molding with pressure less than or equal to breakdown pressure at which magnetic powder particles are broken down; and a step S5 for heating the primary molding 5 at a temperature T4 less than a decomposition temperature T2 of the magnetic powder 1. A ratio D50/D3 of a particle size D50 of a cumulative frequency of 50% and a particle size D3 of a cumulative frequency of 3% is less than 8 when a particle size distribution is measured.
SELECTED DRAWING : Figure 1
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