解砕条件が懸濁液中の粒子集合状態に及ぼす影響の直接観察・評価

摘要

Particle assembling state in suspensions prepared by different ways was numerically characterized by direct observation method. The aqueous suspensions of alumina powder were prepared by ultrasonication and ball milling. The particle assembling state was characterized by settling test and particle size measurement in addition to the direct observation. From the comparison, the particle images in a suspension getting by the direct observation method can much more distinguish coarse aggregates from primary particles than the other ways. And the black and whiteness of the particle images were classified into 256 steps. The mean values and standard deviations of the black and whiteness distributions were calculated. The variation coefficient determined by the standard deviation over the mean value can show the existence of coarse aggregates that were not ground or re-aggregated.%固体粒子を液中に懸濁させた粒子懸濁液は，セラミックス湿式成形プロセスや水処理プロセスのように様々な工業プロセスで使用されている。懸濁液が使用されるプロセスに応じて必要とされる流動特性や充填特性，粒子集合状態といった懸濁液の特性は異なっており，懸濁液を的確に制御する必要がある。