Abstract
The effect of solid concentration on slip-cast density have been investigated for three alumina powders with different particle size distributions. It was clearly observed in the powder with the multi-modal particle size distributions, but slightly in that with a monosize distribution. Once a slip was prepared with a higher solid loading for a long period to proceed homegeneity, no further notable decrease in density with decreasing in solid loadings was observed even for the multi-modal powders. The low green density casted from the slurries with the low solid loadings is attributed to the inhomogeneity that arise mainly from insufficient mixing. Therefore, it is more important for the raw materials with the particle size distributions which are expected to have the higher particle packing density.
