Effect of crushing methods on morphology and magnetic properties of anisotropic NdFeB powders

作     者：王仁全 刘颖 李军 储林华 杨晓娇 邱彧冲 

作者机构：College of Materials Science and Engineering Sichuan University Chengdu 610065 China 

出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)

年 卷 期：2017年第35卷第8期

页      面：800-804页

核心收录：

学科分类：0709[理学-地质学] 0819[工学-矿业工程] 07[理学] 070205[理学-凝聚态物理] 08[工学] 0708[理学-地球物理学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学] 

基　　金：supported by the Foundation of Sichuan Province Development and Reform Commission(2016sfgw001) Sichuan Province Science and Technology Support Program(2014GZ0090,2016GZ0262) Sichuan Province Achievement Transformation Fund(2014GPTZ0003) 

主　　题：hot-deformation mechanical anisotropy crushing microstructure rare earths 

摘      要：Crushing is a critical factor for the anisotropic Nd Fe B powders with high magnetic properties. However, the traditional crushing methods of disk-milling（DM） or impact crushing（IC）, are difficult to obtain high-performance powders. Herein, a new method of preparing anisotropic powders with high performance was reported, which was through crushing the hot-deformed magnets perpendicular to c-axis direction（shear crushing, SC）. The microstructure and alignment of the magnets were examined by scanning electron microscopy（SEM） and X-ray diffraction（XRD）, respectively. The results indicated that the cracks mainly extended along the Nd-rich grain boundary phase and/or the binding interface of ribbons. It not only could protect the magnetic phase from being damaged, but also could keep the grains integrated. Therefore, shear crushing was an effective method for the preparation of highperformance anisotropic powders and then to fabricate the bonded magnets with Br=9.0 kGs, Hci=10.48 kOe and（BH）max=17.7 MGOe.