| 摘要 |
PURPOSE:To obtain a product of good molding characteristic without a crack and high orientation in good yield by pressing power in wet magnetic field after calcinated and ground and then forming in magnetic field after dried and crushed when an anisotropic oxide permanent magnet of basic chemical formula MO.6Fe2O3 (M is Ba or Sr.) is made. CONSTITUTION:An anisotropic oxide of basic chemical formula MO.6Fe2O3 (M is Ba or Sr.) is calcinated for about 1hr at 1,320 deg.C and ground to mean particle diameter 0.74mum using a wet ball mill. The slurry is filled in a metal mold and pressed under a pressure of 200kg/cm<2> in applied magnetic field of 8,000G while moved at a speed of 1mm./sec. The obtained block is dried to remained water of 0.25% and crushed by a crusher added with calcium stearate of 0.5wt%. Then, this is filled in a metal mold, moved at a speed of 3mm./sec. in applied magnetic field of 8,000G and formed under a pressure of 800kg/cm<2>. |
