PURPOSE: To inexpensively obtain an Mn-Al-C magnet of high performance in a high yield by cold molding powder of an Mn-Al-C material having a prescribed composition, sintering the molded body in an evacuated atmosphere under a specified partial pressure of gaseous CO, and subjecting the sintered body to solubilizing heat treatment.
CONSTITUTION: A magnet material consisting of 70wt% Mn, 29.5wt% Al and 0.5wt% c is cast, pulverized, and cold molded into a prescribed shape. The molded body is sintered at a prescribed temp. in an evacuated atmosphere under 1W100 Torr partial pressure of gaseous CO. The sintered body is subjected to solubilizing heat treatment in a cooling stage. By this method a lightweight powerful sintered Mn-Al-C magnet having maximum energy product about 2 times that of isotropic ferrite can be manufactured easily.
KUROISHI ATSUSHI
HARA AKIO
