MANUFACTURING METHOD FOR SINTERED COMPACT

摘要

A manufacturing method for a sintered compact includes a first step in which magnetic powder is fabricated by rapid solidification, a second step in which a mass of the magnetic powder is housed in a forming mold, and preliminary heating is performed by placing the mass of the magnetic powder in a preliminary heating part of the forming mold at first temperature that is lower than coarse crystal particle generation temperature, and a third step in which main heating is performed by placing the preliminarily heated mass of the magnetic powder at second temperature that is lower than the coarse crystal particle generation temperature and higher than the first temperature, and press forming is performed while keeping temperature of the magnetic powder at densification temperature or higher.

主权项

1. A manufacturing method for a sintered compact serving as a precursor of rare earth magnet, comprising:
a first step in which magnetic powder having a microscopic crystal particle is fabricated by rapid solidification; a second step in which a mass of the magnetic powder is housed in a forming mold having a preliminary heating part and a main heating part, and preliminary heating is performed by placing the mass of the magnetic powder in the preliminary heating part at first temperature that is lower than coarse crystal particle generation temperature; and a third step in which main heating is performed by placing the preliminarily heated mass of the magnetic powder at second temperature that is lower than the coarse crystal particle generation temperature and higher than the first temperature, and press forming is performed while keeping temperature of the magnetic powder at densification temperature or higher.