| 摘要 |
PURPOSE:To stably produce a low-oxygen and low-carbon sintered compact by immersing pulverized powder of raw material for rate earth metal sintered magnet into oil, thereafter separating, drying, forming and sintering this powder. CONSTITUTION:The raw material powder for an R-Fe-B rare earth metal sintered magnet (R is one or more kinds of the rare earth metals including Y) is dipped into a mineral oil or a synthetic oil. Successively, the raw material is separated from the oil and dried. The compact is formed by a forming method by which the powder is oriented in the magnetic field and pressurized, and the temp. is raised to about 500 deg.C at <= about 10 deg.C/min temp. raising rate, and thereafter, the sintering is executed at about 950-1150 deg.C and <= about 1Torr pressure to obtain the rate earth metal sintered magnet. It is preferable that the max. of fractional distillation temp. of the mineral oil or the synthetic oil is <= about 400 deg.C. |
