| 摘要 |
PURPOSE:To obtain a rare-earth element-cobalt permanent magnet having good sintering property of the compact, high magnetic flux density and superior maximum energy product by a method wherein a powder mixture of alloy powder having the R2Co17 type phase as a main phase and alloy powder having the RC05 type phase as a main phase is compacted in the magnetic field and then sintered. CONSTITUTION:A powder mixture of alloy powder having the R2Co17 type phase (where R represents one or more rare-earth element) as a main phase and alloy powder having the RC05 type phase as a main phase is compacted in the magnetic field and then sintered. The mixture ratio of said two kinds of alloy powders is preferably such that the alloy powder having the 1-5 type phase as a main phase is not higher than 50% in terms of wt%. If it exceeds 50%, the sintering property shows tendency to be lowered and magnetic characteristics of the permanent magnet are liable to be deteriorated. To improve magnetic characteristics of the permanent magnet, it is desirable to add Fe in the high composition ratio. |
