第三代稀土永磁材料—钕铁硼问世以后,大多数研究者对这种烧结合金采用简单的一级热处理工艺,即在～600℃退火1h 左右,目的是消除晶体缺陷,以减少反向畴的形核,提高矫顽力。我们全面地研究了用(Nd,Pr)混合稀土制备的这种合金的热处理。结果表明,一级退火在600℃效果最好,是由于低于该温度缺陷不易消除;而高于该温度合 After the advent of the third generation of rare earth permanent magnet material - neodymium iron boron, most researchers use a simple first-level heat treatment process on this sintered alloy, that is annealed at ~ 600 ℃ for about 1 h, in order to eliminate crystal defects to reduce the reverse Domain nucleation, improve coercivity. We have thoroughly investigated the heat treatment of this alloy prepared with (Nd, Pr) mixed rare earths. The results show that the first-order annealing at 600 ℃ is the best, because less than the temperature defect is not easy to eliminate; and higher than the temperature