| 摘要 |
PURPOSE: To reduce the amount of residual oxygen in a sintered product and also to improve a dimensional accuracy and productivity of the product by adding a specific weight of hydrophobic agent to rare earth alloy powder, adding a binder and kneading them to form a slurry, forming the slurry into powder by a spray drier, and then compressing and sintering it. CONSTITUTION: A hydrophobic agent is dispersedly mixed into rare earth alloy power to cover the surface of the alloy powder with the hydrophobic agent. The amount of hydrophobic agent then added is in a range of 0.01-2 parts by weight with respect to 100 parts of the rare earth alloy powder by weight. Then added to the mixture, stirred and kneaded together are at least one type of polymer and water as solvent to prepare a slurry. The slurry is made by a spray drier into powder. The powder is compressed, sintered and heat-treated to manufacture a sintered permanent magnet. |
