METHOD OF MANUFACTURING MAGNETIC MATERIAL

摘要

PROBLEM TO BE SOLVED: To provide a method of manufacturing magnetic material having an excellent magnetic characteristic.SOLUTION: A magnetic material manufacturing method comprises a preparation step of preparing Sm-Fe-based alloy containing Sm and Fe, a magnetic field heat treatment processing step of performing a heat treatment on the Sm-Fe-based alloy at a temperature of not less than 250°C to not more than 350°C under an atmosphere or pressure-reduced atmosphere in which Sm and Fe do not react with each other while applying a magnetic field of not less than 2T to not more than 4T, and a rapid heat treatment step for subjecting the Sm-Fe-based alloy to a heat treatment of rapidly heating the temperature from the heating temperature in the magnetic field heat treatment step to a temperature of not less than 600°C to not more than 800°C within 5 minutes under the atmosphere or pressure-reduced atmosphere in which Sm and Fe do not react with each other after the magnetic field heat treatment step, holding the Sm-Fe-based allot at this temperature for a time of not less than 2 minutes to not more than 10 minutes, and then rapidly cooling the temperature to 500°C or less within 5 minutes.SELECTED DRAWING: Figure 1