Microstructures and macroscopic conductivity of randomly packed and uniaxially pressed sphere compacts

摘要

The present paper deals with simulation of microstructures and macroscopic conductivity of randomly packed, uniaxially pressed andsintered particles. Random packings of identical spheres are constructed by using a sequential deposition method and their microgeometryafter the compaction in sintering is geometrically created by proportional reduction in distances between the sphere centers only inthe vertical direction and by mass addition around overlapped necks. Some of microgeometrical characteristics of the created compactsare statistically examined. Using the data on the packings and geometrical models, macroscopic thermal conductivities of the compactsare estimated. It is found that the conductivities are greatly different from those of simple cubic packings, although both the packingshave almost the same coordination number, and that anisotropy in the conductivity is induced by the compaction in addition to gravity.The conductivities are expressed as a function of the compaction and sintering degrees for practical purposes.