| 摘要 |
PURPOSE:To obtain a bonded magnet composition having improved powder fluidity without impairing magnetic characteristics by a method wherein the mixture, consisting of specific magnetic alloy powder, silicon dioxide powder, dicyandiamide powder and at least a kind of thermosetting resin, is mixed with a specific binder. CONSTITUTION:A mixture is obtained by mixing magnetic alloy powder of 100 pts.wt., silicon dioxide powder of 0.01 to 5 pts.wt., dicyandiamide powder, and at least a kind of thermosetting resin. This mixture and a binder, having the kinematic viscosity, by Gardner process, (25 deg.C) of 1X10<-3>m<2>/s or lower in 70wt.% butyl carbitol solution, are mixed and a bonded magnet composition is obtained. Moreover, the magnetic alloy powder is present in the state wherein it is sprinkled on the surface of the binder. As a result, not only the obtained magnet has excellent magnetic characteristics, but also it has very good powder fluidity characteristics, it has excellent moldability, and productivity can be improved. |
