| 摘要 |
PURPOSE:To obtain a permanent magnet of better maximum energy product improving coercive force by heat treatment of an alloy wherein the composition is shown by a specific formula under specific conditions. CONSTITUTION:An alloy of a composition shown by a formula R1-alpha-beta-gamma-deltaFealpha XbetaZgammaCadelta wherein R is one or more rare earth elements, X is one or more among Ti, Zr, Hf, V, Nb, Ta, Cr, Mo and W, Z is one or more among B, C, N, Si and P and 0.60<=alpha<=0.85, 0<=beta<=0.10, 0<=gamma<=0.15, 0<=delta<=0.05 is heat-treated for 0.5hr or more at a temperature of 800-600 deg.C, for 0.5hr or more at a temperature of 600-500 deg.C and for 0.5hr or more at a temperature of 500-350 deg.C. One or more among Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu are used as the rare earth elements. |
