| 摘要 |
PURPOSE:To produce a permanent magnet with high performance at low cost by melting/casting an alloy consisting essentially of R, Fe, and B, filling a metallic capsule therewith, and rolling it in a manner that the relationship between the plate thickness including the capsule after rolling and the roll diameter will be as specified. CONSTITUTION:An alloy composed of Pr16.5Fe77.2B5.1Cu1.2 is melted in an argon atmosphere by using an induction heater and then it is cast to obtain a cast sample having a columnar crystal structure. The cast sample is filled in an SS41 capsule and sealed by soldering, then, after heating it in the heater, it is rolled by a rolling machine. In this case, the relationship between the plate thickness including the capsule after rolling and the roll diameter is kept to satisfy T/D<0.1, and further the rolling with a draft of 10-25% is carried out at least 1 pass. Thus a large magnet having a high mechanical strength can be obtained at low cost. In addition, magnetic characteristics can be also improved. |
