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CN104681225A 一种提高烧结钕铁硼材料性能的处理方法 无效 - 驳回

一种提高烧结钕铁硼材料性能的处理方法
摘要：
一种提高烧结钕铁硼材料性能的处理方法。本发明属于烧结钕铁硼磁体制备领域，通过对烧结钕铁硼磁体微观结构和成分的后期改变，来提高烧结钕铁硼磁体的矫顽力。即在已经烧结的钕铁硼磁体基材的表面形成含有Dy、Tb、Ho、Al和Ga中的一种元素或多种元素组合的涂覆层，加热至所述磁体基材烧结温度以下的温度进行回火热处理，由此将涂覆层中的Dy、Tb、Ho、Al和Ga中的一种元素或多种元素扩散到所述磁体基材内部晶界处，改善磁体的微观结构和局部成分，从而提高烧结钕铁硼磁体的矫顽力。
摘要（英）：

The invention discloses a treating method for improving performance of sintered NdFeB (neodymium iron boron) materials and belongs to the field of sintered NdFeB (neodymium iron boron) magnet preparing. By means of post-changing of a microstructure and ingredients of a sintered NdFeB magnet, coercive force of the sintered NdFeB magnet is increased. The treating method includes the steps of forming a coating layer comprising one of or a combination of a variety of Dy, Tb, Ho, Al and Ga on the surface of the sintered NdFeB magnet, and heating the sintered NdFeB magnet up to the temperature lower than the sintering temperature of a base material of the magnet so as to perform tempering heat treatment. According to the treating method, one of or more of the Dy, the Tb, the Ho, the Al and the Ga in the coating layer are diffused to the crystal boundary position inside the base material of the magnet, so that the microstructure and partial ingredients of the magnet are improved, and the coercive force of the sintered NdFeB magnet is increased.

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