混料工艺对Sr(CaLaCo)M永磁铁氧体磁性能的影响

Effect of mixing process on the magnetic properties of Sr(CaLaCo)M permanent magnet ferrite

采用传统工艺制备Sr(CaLaCo)M永磁铁氧体,分别采用干混和湿混工艺,并采用不同的预烧和烧结温度,对比两种混料工艺的材料磁性能。结果表明,在1260℃进行预烧时干混料的综合磁性能更好,剩磁最高达到437 mT,内禀矫顽力最高达到384 kA/m,性能稳定。湿混料在1230℃预烧时综合磁性能较好,剩磁最高为438 mT,内禀矫顽力最高为415 kA/m。湿混工艺减小了原料的粒度,增大比表面积,降低反应所需要的能量,更适合低温预烧,从可烧结范围上看湿混低温预烧的工艺稳定性最好。1260℃预烧的干混料却能在1225℃烧结下获得本材料最高磁能积35.4 kJ/m3。

Sr(CaLaCo)M permanent magnet ferrite was prepared by traditional process.The magnetic properties of dry and wet mixing samples were compared under different calcining and sintering temperature.The results show that the magnetic properties of dry mixing sample are better when calcining at 1260℃,with the maximum remanence of 437 mT,and the highest intrinsic coercivity value of 384 kA/m.The magnetic properties of the wet mixing sample are better when calcining at 1230℃,with the intrinsic coercivity value of 415 kA/m and the highest remanence of 438 mT.Wet mixing process reduces the particle size of raw materials,increases the specific surface area and reduces the energy needed for reaction,so it is more suitable for low temperature calcining.Dry mixing calcined at 1260℃and sintered at 1225℃can obtain the highest maximum magnetic energy product of 35.4 kJ/m3.