Abstract
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 increase ratio of porosity of powder bed in every mixed powder was obtained asWs/f(e)×(W0-Ws)=α+βWs/W0where Ws is the weight of added powder, W0 is that of total powder mixed and e is the porosity. The constant β was related to the equilibrium porosity, but the meaning of the constant α was not yet known.
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