Effect of grain boundary diffusion of Pr-based alloy on the properties and structure of sintered NdFeB
Pr,Pr96Al4,Pr83Cu17 and Pr80 Co20 coatings were applied to the surface of sintered NdFeB magnets by screen printing technology,and the grain boundary diffusion heat treatment was carried out.The magnetic proper-ties,temperature stability,phase structure and microstructure of the diffused magnets were compared and analyzed.The results show that the intrinsic coercivity of the diffused magnets was increased by more than 4 kOe,an increase of more than 35％,and the remanence was reduced by less than 0.3 kGs,a decrease of less than 3％.The high-temperature coercivity of the diffused magnets were significantly improved,the high-temperature remanence,rema-nence temperature coefficient and coercivity temperature coefficient were basically unchanged,and the Curie temper-ature of the Pr80Co20 diffused magnet was increased by 7.3 ℃.The diffusion source diffuses into the magnet along the grain boundary,which significantly increases the number of RE-rich phase in the grain boundary,effectively iso-lating the main phase grains.
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