| 摘要 |
PURPOSE:To obtain the magnet material excellent in all of sintering property, dimensional accuracy and magnetic characteristics by injecting and molding FeCrCo group permanent-magnet material powder by using at least two kinds of organic materials and removing a binder and sintering a shape. CONSTITUTION:Alloy powder consisting of Co, Cr, Si, Ti, Mo, Al and B and a binder consisting of HDPE, APP (high molecular weight) and APP (low molecular weight) are heated and mixed at a ratio of 98:5:9:3, and formed to a columnar shape by an injection molding machine. The shape is degreased through heating, sintered, solution heat treated, thermally treated in a magnetic field and aging-treated continuously. At least two kinds of materials of a thermoplastic resin, a thermosetting resin, a natural resin, a rubber, an elastomer, a slip additive and a plasticizer are combined and used as the organic materials, a heating loss curve is measured previously by a differential thermal analyzer, etc., and a plurality of binders are combined properly. Accordingly, the powder, the organic materials and the binders are mixed so as to be degreased at every approximately fixed quantity to a gradient of a heating temperature. |
