温压工艺在粘结NdFeB磁体中的应用

Application of warm compaction technology in bonded NdFeB magnet

采用温压工艺与普通压制工艺制备粘结磁体,发现温压技术可以有效地提高粘结磁体的密度,改善磁体磁性能,且温压效果与温压温度的选择密切相关。通过对温压机理的分析,发现最佳温压温度由粘结剂的软化点、粘度和固化点三个因素共同决定。采用温压工艺,在70oC、97.4MPa的条件下,得到的粘结NdFeB磁体密度、最大磁能积分为5.28kg/m3、6.23MGOe。

Warm compaction and common compaction were applied to prepare bonded NdFeB magnet.<P> Warm compaction was proved to be a good way to improve the density and magnetic performance of bonded magnet, comparing with common compaction. The result of warm compaction is closely related with temperature. And the softening point, the viscosity and the solidifying point of bond decide the optimal temperature, according to the mechanism of warm compaction. The density and maximum energy product ((BH)m) of bonded NdFeB magnet prepared at 70oC, 97.4MPa pressure are 5.28kg/m3 and 6.23MGOe respectively.