In order to improve the coercivity of the sintered Nd-Fe-B magnet,a Nd13.5Fe79.75B6.75magnet with intergranular multi-addition of 2%Dy H3,2%Nd H3and 1%Nd2O3is prepared and its magnetic property and microstructure are ...In order to improve the coercivity of the sintered Nd-Fe-B magnet,a Nd13.5Fe79.75B6.75magnet with intergranular multi-addition of 2%Dy H3,2%Nd H3and 1%Nd2O3is prepared and its magnetic property and microstructure are analyzed.The results show that the coercivity of the magnet with multi-addition is as high as 1 300 k A/m,while that of the magnets with Dy H3and Nd2O3are 520 k A/m and 850 k A/m,respectively.Scanning electron microscope（SEM）shows that the grain boundaries in the magnet with multi-addition are smoother and the grain size is smaller than that in the magnet without the addition.Compared with addition of Dy H3or Nd2O3,the multi-addition can more effectively enhance coercivity of the magnet.Intergranular adding process with multi-addition can both increase the anisotropy field and optimize the grain-boundary microstructure of the magnet.As a result,the coercivity of the magnet is significantly increased.展开更多
基金Supported by the National Natural Science Foundation of China(51172168,51072139)the National Basic Research Program of China(973 Program)(2014DFB50130,2011CB612304)
文摘In order to improve the coercivity of the sintered Nd-Fe-B magnet,a Nd13.5Fe79.75B6.75magnet with intergranular multi-addition of 2%Dy H3,2%Nd H3and 1%Nd2O3is prepared and its magnetic property and microstructure are analyzed.The results show that the coercivity of the magnet with multi-addition is as high as 1 300 k A/m,while that of the magnets with Dy H3and Nd2O3are 520 k A/m and 850 k A/m,respectively.Scanning electron microscope（SEM）shows that the grain boundaries in the magnet with multi-addition are smoother and the grain size is smaller than that in the magnet without the addition.Compared with addition of Dy H3or Nd2O3,the multi-addition can more effectively enhance coercivity of the magnet.Intergranular adding process with multi-addition can both increase the anisotropy field and optimize the grain-boundary microstructure of the magnet.As a result,the coercivity of the magnet is significantly increased.
