| 摘要 |
PURPOSE:To reduce the sintering temperature dependency of a permanent magnet so as to manufacture the permanent magnet stably by mixing Co with specific principal constituent elements contained in specific weight percentages. CONSTITUTION:This permanent magnetic contains 22-28wt.% R (R: rare earth elements), 10-25wt.% Fe, 1-5 wt.% Cu, 0.2-5% M (M: at least one of Zr and Hf), and 0.05-0.5wt.% Nb. When the adding quantity of Nb is >=0.05wt.%, the break in the second quadrant disappears and the angularness is improved, but, when the quantity is >=0.5wt.%, the density of residual magnetic fluxes considerably drops and no merit can be expected from the addition. Moreover, when the adding quantity of rare earth elements is <22wt.%, no sufficient coercive force is obtained and, when the quantity is >28wt.%, the density of residual magnetic fluxes drops. When an appropriate quantity of Nb is added in such way, the angularness in the second quadrant of this R2Co17 permanent magnet can be improved. |
