摘要：在永磁铁氧体细粉碎时添加分散剂,采用费氏粒度仪、黏度计、电泳仪等对永磁铁氧体料浆的分散性进行测试,利用沉降法比较料浆粒径及其分布,对生坯c晶面的取向度进行X射线衍射分析,采用永磁标准测量仪对永磁铁氧体元件的磁性能进行测试。结果表明:加入分散剂后,浆料的流动性、zeta电位值、生坯c晶面的取向度均得到明显的改善,提高幅度达18%以上;2组分的复配分散剂改善铁氧体生坯c晶面取向度的效果优于单一分散剂的,3组分复配的分散剂D改善浆料的流动性、zeta电位值、生坯c晶面取向度的效果最优,且在烧结后,永磁铁氧体元件的龟裂现象及其剩余磁感应强度、取向度、内禀矫顽力等磁参数也得到更显著的改善;添加0.5%~1.0%(质量分数)的分散剂D对铁氧体颗粒表面进行改性时,用氨水调节永磁铁氧体料浆的p H值为8~11时较理想。

关键词：永磁铁氧体；分散剂；料桨；磁性能；黏度

Abstract：The dispersant was added in the process of fine crushing of the permanent magnetic ferrite. The disperse state of the slurry of permanent magnetic ferrite was tested by Fisher sub-sieve sizer, viscosity meter, and electrophoresis. The slurry particle size and distribution were compared by the sedimentation method. The orientation of crystal c-plane of green ferrite was analyzed by XRD. The magnetic property of the permanent ferrite was tested by permanent magnetic standard gauge. The results show that the slurry flow, zeta potential values, orientation of crystal c-plane of the green ferrite are significantly improved after adding a dispersant, and the increase rate reaches greater than18%. The effect of pair combinations of the complex dispersants improving the crystal c-plane orientation of the green ferrite is better than that of a single dispersing agent. The dispersant agent D complexed by dispersant agent A, B and C actually improves the fluidity of the slurry, zeta potential values, and crystal c-plane orientation of the green ferrite. After sintering, the cracking problem of magnet and magnetic parameters of the permanent ferrite such as residual magnetic flux density, degree of orientation, and coercive force also have a more significant improvement. When the pellet surface of the ferrite is modified by the dispersing agent D with mass fraction between 0.5% and1.0%, it is desirable to adjust the p H value of the permanent magnetic ferrite slurry from 8 to 11 with ammonia.

Keywords: permanent magnetic ferrite；dispersant；slurry；magnetic property；viscosity