| 摘要 |
PURPOSE:To simplify a manufacturing process as compared with a conventional sintering method and a conventional quenching method by a method wherein an alloy, which is composed of B, Co, Al, Cu, Ga, including R and Y, of specific atomic % and a remaining part such as iron and others, is melted and cast and it is then hot-worked at higher than a specific temperature. CONSTITUTION:For a rare-earth element-iron-based permanent magnet, an alloy, which is composed of 8-30atomic% R, 2-28atomic% B, 50atomic% or less Co, 15atomic% or less Al, 6.0atomic% or less Cu, 6.0atomic% or less Ga and a remaining part such as iron and other impurities which are inevitable for a manufacturing process, is melted and cast; after that, its cast ingot is hot-worked at a temperature of 500 deg.C or higher; its crystal particle is made fine; its crystal axis is oriented in a specific direction; the cast alloy is made magnetically anisotropic. Especially in order to enhance a coercive force, the alloy is composed of 8-25atomic% or less Co, 15atomic% or less Al, 6.0atomic% or less Cu, 6atomic% Ga and a remaining part such as iron and others; it is heat-treated at a temperature of 250 deg.C or higher; a cast magnet alloy which is hardened magnetically can be obtained. |
