PURPOSE: To obtain a bonded magnet whose magnetic characteristic is high by a method wherein a permanent-magnet bulk body is collapsed by hydrogen and an obtained raw-material powder is molded in a magnetic field and a heat treatment is executed.
CONSTITUTION: A permanent-magnet bulk body obtained by quenching and, after that, hot-working the molten solution of an alloy whose fundamental components are a rare-earth element, iron and boron is collapsed by hydrogen; in addition, it is crushed mechanically and classified. A classified pulverized body is molded in a magnetic field; after that, it is heat-treated in an inert atmosphere; then, it is impregnated with a resin. That is to say, when the permanent-magnet bulk body is placed in an atmosphere of hydrogen, it occludes hydrogen and is collapsed. In addition, when it is crushed mechanically, a crystal particle 11 is split into a plurality of particles 11a, 11b. However, they are placed in the atmosphere of hydrogen and are not subjected to a bad influence such as oxidation or the like. After that, the particles are molded to a desired shape in the magnetic field and are heattreated. The split crystal particles 11a, 11b are bonded at split faces. A bad influence on a chemical activity by the split faces is eliminated. Thereby, it is possible to obtain a bonded magnet which can display a high magnetic characteristic.
NAKANO HIROFUMI
MATSUI KAZUO
| JPS6354702A | 1988-03-09 | |||
| JPS62257703A | 1987-11-10 | |||
| JPS64704A | 1989-01-05 | |||
| JPS6223902A | 1987-01-31 |