Sintered NdFeB permanent magnet materials have been widely used in various fields due to their excellent magnetic properties.Firstly,the application fields of sintered NdFeB permanent magnet materials are summarized,and then the production process of the materials is briefly introduced.On this basis,the heavy rare earth grain boundary diffusion process,which is an important technical approach to the high performance and low cost of sintered NdFeB permanent magnet materials,is emphatically expounded,and various grain boundary diffusion methods and their advantages and disadvantages are introduced in detail.Finally,the market development trend of high-performance sintered NdFeB permanent magnet is prospected.
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