| 摘要 |
PURPOSE:To obtain an R-T-B hot-worked magnet on which a plastic processing can be conducted easily and having excellent magnetic crystal orientation and magnetic characteristics by a method wherein its carbon content is limited to a specific range. CONSTITUTION:In a magnetically anisotropic permanent magnet made of R-T-B-C alloy, which is mainly composed of transition metal T and containing yttrium-carrying rare-earth R and boron B, having fine crystal grains of average grain diameter of 0.2 to 1.0mum, carbon content is set at 0.01 to 0.8wt.%. Also, the permanent magnet such as above-mentioned is composed or R-content of 28 to 35wt.%, T-content of 60 to 72wt.%, B-content of 0.5 to 1.5wt.% and other inevitable impurities, and the angle dispersion from the C-axis of the degree of crystal orientation measured by X-rays is set at 30 degrees or less on the surface of the magnet. As a result, excellent self-lubricating properties can be obtained when a hot-work operation is conducted, and also a permanent magnet having a high energy product can be obtained. |
