【作者】 强文江； 蔡纯； 许云华； 张茂才； 乔祎；

【Author】 Qiang Wenjiang Cai Chun Xu Yunhua Zhang Maocai~+ Qiao Yi~+ (School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing,100083,China) (+ State Key Laboratory for Advanced Metals and Materials,Beijing,100083,China)

【机构】 北京科技大学材料科学与工程学院； 国家新金属材料重点实验室；

【摘要】 本文对Nd₁₆Fe₇₇B₇永磁合金的球磨粉末经磁场取向后进行了松散态下的热处理实验。结果表明:适当温度下的热处理使得松散粉末变成了有一定结合强度、但表面仍很发达的"粉末烧结体",其矫顽力大幅度提高。对其进行二次破碎得到的磁粉较好地保持了原粉末烧结体的矫顽力,具有较高的永磁性能。更多还原

【Abstract】 A new method for preparing anisotropic NdFeB permanent magnet powders was investigated. The NdFeB magnetic alloy was first ball-milled to single crystalline fine powders as are normally used to preparing sintered magnet.A thermal annealing was then followed to the loose packed powders under vacuum protection after magnetic alignment.The experimental results showed that the annealing treatment at temperatures lower than the sintering temperature of a sintered magnet markedly enhanced the coercive force of the"loose powders-sintered magnet",in which weak bonding force appeared between the neighbouring grains during the annealing.A secondary crush was necessary to the"loose powders-sintered magnet"to obtain final powders for bonded magnet,during which the coercive force loss is proved to be tolerable.更多还原