| 摘要 |
PURPOSE:To obtain an anisotropic bonded magnet powder with high magnetization and energy product by adding specific additive elements of less than specified amount to the starting material and orienting the fine crystals to be formed into powder respectively after hydrogenation and dehydrogenation. CONSTITUTION:A cast billet consisting of less than 10-12at% R, 80-90at% T and 10at% M is subject to solution heat treatment. (R: one kind of rare earth metals that contains Y and more than 50% of Sm; T: Fe or a part of Fe is replaced with Co of at least 50%; M: one or more than two kinds of Al, Ti, V, Cr, Ni, Ga, Zr, Nb, Mo, In, Sn, Hf, Ta, and W) The roughly crushed powder is dehydrogenated by an H2 gas of 0.1-10atm at 1X10<2>Torr of H2 partial pressure while it is heated at 750-900 deg.C for 30min to 8hr. Thus, a powder body, whose average grain size is 0.05-3mum and which has an aggregated composition where fine crystals forming respective powders are oriented specifically in orientation, can be obtained. |
