| 摘要 |
PURPOSE:To obtain permanent magnet alloy having high max. energy product and superior magnetic characteristic, by soln. heat treating rare earth bearing Co permanent magnet alloy, then cooling it, and applying heating, holding and cooling treatments in 3 steps under regulated conditions. CONSTITUTION:Permanent magnet alloy composed of 20-30wt% R (R is >=one kind among rare earth element such as Sm, Ce), 10-25% Fe, 2-10% Cu, 0.5-6% M (M is >=one kind among Zr, Hf, Ti) and the balance Co substantially is soln. heat treated, then cooled. Next, the alloy is heated and held at 750-850 deg.C, then cooled to <=600 deg.C at 0.1-5.0 deg.C/min rate. It is heated and held again at >=650-<750 deg.C, and cooled to <=500 deg.C at said rate. Further it is heated and held at >=550-<650 deg.C and cooled to <=400 deg.C at said rate. By the aging treatment, magnetic characteristic such as extremely large max. energy product, etc. is obtd. |
