Influence of particle-size and pore-size distributions on sintering kinetics of powder material


I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Omeliana Pritsaka str.,3, Kyiv, 03142, Ukraine
Mathematical Models and Computing Experiment in Material Science - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2010, #12


Article is devoted to the modeling and comparison of densification rates for the sintering of powder packings with mono-modal and bi-modal particle-size distributions. Modeling has been carried out in a two-dimensional approximation. Powder packings for numerical modeling have been obtained by ballistic method. Surface and grain-boundary diffusion were assumed to be the main mass-transfer mechanisms. This is valid for the sintering of fine ceramic powders. Results of the modeling demonstrate that sintering densification rate is sensitive to the particle-size and pore-size distribution in powder material. This means that in some cases, correct sintering modeling needs information not only about average porosity but also about initial particle-size and pore-size distributions.