粘结剂含量对粘结NdFeB磁体力学性能和磁性能的影响

Influence of Binder Content on Mechanical and Magnetic Properties of Bonded NdFeB Magnets

摘要:

粘结剂作为粘结NdFeB磁体制备过程中的重要组成部分，其作用是提高磁粉颗粒的流动性和粘结强度，保证产品的力学性能和磁性能的稳定。采用理论与实验相结合的方法，研究了粘结剂含量对粘结NdFeB磁体力学性能和磁性能的影响。在此基础上，制备了高性能粘结NdFeB磁体。利用扫描电子显微镜（SEM）对磁体的结构和形貌进行了表征。在NIM-200C磁滞回线仪和电子万能试验机（AG-X plus）上分别测定了环形粘结NdFeB磁体（RSM）的磁性能和力学性能。结果表明，当粘结剂含量为3%（质量分数）时，粘结NdFeB磁体密度最高（5.59 g/cm³），抗压强度最高（159 MPa），磁性能最佳。

Abstract:

As an essential component in the preparation of bonded NdFeB magnets, the function of binder is to improve the fluidity of magnetic powder particles and the bonding strength, ensuring the mechanical and magnetic stability of products. The selection of binder content and its effects on the mechanical and magnetic properties of bonded NdFeB magnets were studied by combining theory with experiment. On this basis, high performance bonded NdFeB magnets were prepared. The structure and morphology of the magnet were characterized by the scanning electron microscope (SEM). The magnetic and mechanical properties of ring-shaped bonded NdFeB magnet (RSM) were measured under conditions of NIM-200C hysteresigraph and electro-mechanical universal testing machines (AG-X plus), respectively. The results demonstrate that bonded NdFeB magnet with 3wt% binder is able to achieve the highest density of 5.59 g/cm³ and the highest compressive strength of 159 MPa with the optimum value of magnetic properties.