Effect of Dispersant on the Dispersing Behavior of Barium Ferrite Slurry

Different dispersants (sodium dodecyl sulphate, polyethylene glycol 20000 and their composite) were added in the milling of barium ferrite slurry. The effect of dispersants and pH value on the dispersing behavior of barium ferrite in preparation of slurry was studied by applying particle size analysis, scanning electron microscopy (SEM), fourier transform infrared spectroscopy(FTIR), X-ray diffraction (XRD) and viscosity measurement. The results indicated that the dispersion of the slurries can be improved by adding dispersants, and the better dispersion is obtained by use of composite dispersant rather than individual dispersant. It can be seen from the FTIR analysis that high surface activity of barium ferrite particles is decreased by adding dispersants. The powder XRD patterns show that no change in phase structure occurs after ball milling with composite dispersant at pH=10.