【摘要】 采用传统氧化物陶瓷法制备Sr_0.44Ca_0.08La_0.48Fe_11.3Co_0.3O_19-δ铁氧体永磁材料,系统探究了CaCO₃-SiO₂组合添加对材料微结构及磁特性的影响。结果表明,适宜CaCO₃-SiO₂组合掺杂可促进烧结致密化,同时抑制晶粒长大,提高材料的剩磁B_r和矫顽力H_c。在CaCO₃掺杂量为0.5～0.9 wt%、SiO₂掺杂量为0.25～0.40 wt%范围内,当CaCO₃和SiO₂掺杂量分别为0.6 wt%和0.3 wt%时,烧结样品晶粒分布均匀且致密,具有较优磁特性,剩磁、矫顽力、磁能积达到最大,分别为:B_r=4120 G,H_cj=4031 Oe,H_cb=3677 Oe,（BH）_max=4.19 MGOe。更多还原

【Abstract】 The Sr_0.44Ca_0.08La_0.48Fe_11.3Co_0.3O_19-δ permanent ferrites were prepared by conventional oxide ceramic methods The effects of CaCO₃-SiO₂ additives on the microstructure and magnetic properties of LaCaCoSrM ferrite were researched systematically.The results indicate that the combined doping of CaCO₃-SiO₂ additives could promote the sintering densification and block the grain growth,which leads to the improvement of both the remanence B_r and coercive force H_c.When the respective doping amount of CaCO₃ and SiO₂ additives are within range of 0.5-0.9 wt%,and 0.25-0.40 wt%,M-type strontium permanent ferrites have homogeneous and compact particles,and optimal magnetic properties at the combined 0.6 wt% CaCO₃ and 0.3 wt% SiO₂ addtives.Meanwhile,the remanence Br,coercivity H_cj and H_ob,maximum energy product（BH）_max are 4120 G,403 1 Oe,3677 Oe and 4.19 MGOe,respectively.更多还原