| 摘要 |
A method of manufacturing an R-Fe-B hot-deformed magnet according to the present invention comprises the steps of: preparing R-Fe-B magnetic powder; mixing the magnetic powder with a high melting point metal or a metal composition including a high melting point metal; press-sintering the mixture; and hot-deforming the sintered body by applying heat and pressure. According to the method, the growth of crystal grains may be inhibited, and a sintering process performed at about 1000°C or more is unnecessary. Also, the crystal grains may be magnetized in one direction by the hot-deformation even though magnetic fields are not applied, so as to achieve economic production. Also, the R-Fe-B hot-deformed magnet according to the present invention has a structure in which anisotropic plate crystal grains, each of which has a mean diameter of about 400 nm to about 900 nm, are uniformly distributed over the entire magnet. Thus, the crystal grains in the magnet may have a uniform and fine size to ensure excellent coercive force. The plate crystal grains formed by the hot-deformation may be magnetized in one direction to have excellent residual magnetic flux density. |
