钡铁氧体磁粉在液相中的分散性能

为了提高分散作用效果,选用聚乙二醇-20000(PEG-20000)、十二烷基硫酸钠(SDS)及二者组成的复配分散剂,利用机械球磨与添加分散剂相结合的分散方法制备了钡铁氧体浆料,通过考察分散剂的用量、浆料的pH值、zeta电位对分散性的影响,根据红外光谱分析,研究了分散剂的分散效果及作用机理,并测定了分散前后磁场成型各向异性钡铁氧体材料的磁性能。结果表明:加入分散剂可以改善钡铁氧体的分散效果,且SDS和PEG-20000的用量为钡铁氧体质量的1%和2%时,分散效果最好。SDS和PEG-20000均为静电和空间位阻稳定作用。分散后磁场成型各向异性钡铁氧体材料的磁性能得到提高。

Dispersion of Barium Ferrit Magnetic Powder in Liquid Phase

In order to improve effect of the disperse, polyethene glycol20000(PEG-20000),sodium dodecyl sulfate(SDS)and their compound were chosen as the dispersants,the dispersion of barium ferrite suspension prepared by ball milling with the dispersants were studied. The influences of different dispersants,dispersant content,the pH value on particle size and stability of barium ferrite suspension were investigated. In addition, zeta potential and FTIR were measured to study the mechanism of the dispersants. The magnetism of the anisotropic barium ferrite material before and after disperse was also be measured. The results showed that the dispersants improved the dispersion of barium ferrite suspension effectively. The best dispersion effect obtained with the dosage of the SDS and PEG-20000 was 1% and 2% relative to the mass of the barium ferrite respectively. The dispersion mechanism of the PEG-20000 and SDS compound dispersant was electrostatic and steric hindrance. The magnetism of the dispersed anisotropic barium ferrite material was improved.