The Pr,Cu and Pr75Cu25 were deposited on the sintered NdFeB by magnetron sputtering technology,and the samples were subjected to grain boundary diffusion heat treatment.The magnetic properties,microstructure,temperature stability and bending strength of the magnet were analyzed.Compared with the blank magnet,the grain boundary of the diffusion magnet has increased and enhanced the Nd phase and its continuity,isolated the main phase grain,and the magnetic decoupling effect is stronger.The coercivity of Pr and Pr75Cu25 diffusion magnets increased from 12.86 kOe to 14.69 kOe and 15.78 kOe,respectively,and the coercivity in the diffusion Cu magnet is increased from 13.38 kOe to 14.83 kOe.In the temperature range of 20 to 120 ℃,the|β|of diffusion Pr,Cu and Pr75Cu25 magnets decreases by 0.034％/℃,0.021％/℃ and 0.089％/℃,respectively.The Hirr decreases by 20.96％,0.94％and 27.71％,respectively.The average bending strength increases by 55.89 MPa,149.00 MPa and 130.21 MPa,respectively.
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