| 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, zinc oxide powder, dicyandiamise 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., zinc oxide powder of 0.01 to 5 pts.wt., dicyandiamide powder, and at least a kind of thermosetting resin. This mixture is mixed with a binder having the kinematic viscosity (25 deg.C) by a Gardner process of 1X10<-3>m<2>/s or lower in a butyl carbitol solution of 70wt.%, and a bonded magnet composition is obtained. Besides, the magnetic alloy powder is coated with a binder, and the zinc oxide powder is allowed to be present on the surface of the binder in a sprinkled state. As a result, not only the obtained magnet has excellent magnetic characteristics, but also it has very good powder fluidity characteristics, it is excellent in moldability, and its productivity can also be improved. |
