Hydrogen crushing device for rareearth magnetic material and manufacture of its powder and magnet using sush device

Application Number: 00100874
Application Date: 2000.02.17
Publication Number: 1267065
Publication Date: 2000.09.20
Priority Information: 1999/2/19 JP 41341/99
International: B22F9/04;H01F1/06;H01F41/02
Applicant(s) Name: Sumitomo Special Metal Co., Ltd.
Inventor(s) Name: Ota Akiyasu;Senmoto Akihito;Okayama Kokki
Patent Agency Code: 11021
Patent Agent: wang huimin
Abstract To prevent the oxidation of a material, while safely and efficiently performing a hydrogenation granulating treatment stage for a rare-earth magnetic material and a subsequent cooling stage, and to improve magnetic properties.In this hydrogenation granulating apparatus 10 for performing hydrogenation granulating treatment of a rare-earth magnetic material, an outlet chamber 12 is provided in front of an outlet hole 16 of a furnace body 14, and inert gas is fed into the chamber 12. When the rare-earth magnetic material after hydrogenation milling is taken out and moved to a conveyance device 26, the magnetic material can be hereby prevented from coming into contact with the air. Conveyance, after hydrogenation milling, and cooling are also performed in an inert gas, and the raw material in a high temperature state can be prevented from being brought into contact with the air and from resultantly being oxidized.