| 摘要 |
PURPOSE:To obtain a high density isotropic Mn-Al-C magnet of high performance by sintering a molded body of Mn-Al-C powder having a prescribed composition in an evacuated atmosphere under a specified partial pressure of gaseous CO and by subjecting the sintered body to hot hydrostatic pressure molding and soln. heat treatment. CONSTITUTION:A magnet material consisting of 70wt% Mn, 29.5% Al and 0.5% C is cast, pulsverized, and cold molded into a prescribed shape. The molded body is sintered in an evacuated atmosphere under 1-100Torr partial pressure of gaseous CO. The sintered body is subjected to hot hydrostatic pressure molding at about 1,000-1,100 deg.C to increase the density, and soln. heat treatment is carried out in a cooling stage. By this method a sintered isotropic Mn- Al-C magnet comparable to a refined material in magnetic characteristics can be manufactured simply. |
