Abstract
Particle size distributions of silica slurry with high volume fraction were characterized by ultrasonic attenuation spectroscopy (UAS). When the volume fraction was smaller than 20vol%, the mean diameters evaluated with viscous loss and scattering loss in UAS was a good agreement with those evaluated by X-ray sedimentation method at about 3vol%. For slurry with more than 20vol%, the structrual loss was additionally applied to obtain good fitting curves.