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

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.