Effect of Sintered NdFeB Powder Particle Size on Mechanical Properties and Magnetic Properties of Magnets AITranslate

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Chinese Library Classification Number:TM273[一般工业技术—材料科学与工程]

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Sintered NdFeB,as a key rare earth permanent magnetic material,has been widely used in many fields such as aerospace,new energy vehicles and so on.However,its toughness is not good,and this defect has an adverse effect on the machining performance.In order to improve the processing properties of the material,the influence of powder particle size on the mechanical properties and magnetic properties of Nd-FeB magnet with a composition of Re_30.5B_0.9Fe_balM_1.1was studied in this paper.The experimental results show that after increasing the particle size of NdFeB powders,the average bending strength of the magnet decreases,but the fracture toughness is improved.When the particle size of NdFeB powders increases from 2.97μm to 3.37μm,the average grain size of the magnet increases from 4.206μm to 6.382μm.The fracture toughness of the magnet increases by 22.1%from 2.94 MPa·m^1/2to 3.59 MPa·m^1/2.The average bending strength of the magnet decreases by 15.4%from 367.39 MPa to 310.83 MPa.The powder particle size has no obvious influence on the residual magnetism of the magnet,but the coercive force decreases as the powder particle size increases.