To investigate the effect of annealing treatment on the microstructure and magnetic properties of NdFeB magnets,powder sintered NdFeB magnets were annealed at 500-600 ℃.XRD,SEM and magnetic performance measuring instruments were used to analyze and characterize the NdFeB magnets.The results show that the annealing treatment has little effect on the structure of the main phase Nd2Fe14B of the NdFeB magnets,but mainly affects the distribution and composition of the rich-Nd phase.After annealing treatment,the coercivity of the NdFeB magnets is improved to varying degrees.After annealing at 550 ℃,the rich Nd phase is continuous and uniformly distributed along the grain boundaries of the Nd2Fe14B main phase,and the content of Nd in the rich-Nd phase increases while the content of Fe decreases,and the coercivity of the magnets has the best improvement effect,increasing from 1135 kA/m to 1434 kA/m,correspondingly increased by 26.3％.After annealing treatment,the residual magnetism of the magnets doesn't change significantly,but the maximum magnetic energy product decreases to varying degrees.
关键词
钕铁硼磁体/退火温度/微观结构/内禀矫顽力/剩磁/最大磁能积
Key words
NdFeB magnets/annealing temperature/microstructure/coercivity/residual magnetism/maximum magnetic energy product
维普
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