粒子径の異なる微粉体の混合における空隙率の変化

概要

論文の詳細を見る
The packing models such as those devised by Hudson and Horsfield and ordinarily used for mixed powders of different sizes are not applicable to fine powders in which the force of interaction between the powder particles can not be neglected. The change of porosity based upon mixing of fine powders having different particle size, was measured. The porosity increased rapidly by addition of small amount of fine powders. However, the porosity seemed to remain constant within certain range of further addition of fine powders. But it increased again when more amount of fine powders were added beyond this range. The mechanism of this process can be explained by a simple assumption that cohesion of small particles to larger ones increased their points of contact. And the relation between the weight fraction of the small particles added and the increases ratio of porosity of powder bed in every mixed powder was obtained as [numerical formula] where W_s is the weight of added powder, W_0 is that of total powder mixed and ε is the porosity. The constant β was related to the equilibrium porosity, but the meaning of the constant α was not yet known.
社団法人日本材料学会の論文
1968-07-15