| 摘要 |
PURPOSE:To improve the magnetic characteristics of a resin bound fine powder magnet with an alloy consisting of rare earth components and transition metal components as a raw material by applying a pretreatment of specific conditions to the raw material alloy. CONSTITUTION:An intermetallic compd. consisting of rare earth components such as Y, Sm, Pr, Nd, Ce and transition metals such as Co, Fe, Ni, Mn as raw materials for magnets are pulverized down to 3mu average grain sizes. After the powder is compression molded in a magnetic field, the moldings are sintered in an inert gas such as gaseous Ar and are slowly cooled down to about 300 deg.C at 5 deg.C/hr cooling rate. Thereafter the moldings are further reheated to 850 deg.C and are subjected to an aging treatment for the purpose of improving coercive force. After the sintered bodies are cooled quickly, the bodies are pulverized again and an epoxy resin is added at about 5wt% to the powder and both are mixed. The mixture is compression molded in a magnetic field and is calcined and solidified to the curing temp. of the resin, whereby the permanent magnet having excellent magnetic characteristics is produced. |
