Abstract
We define nanopowder sintering as the conversion of a loose agglomerate of nanoparticles into a nanostructured solid. This means that grain boundaries between the particles must survive the sintering process to a large extent. The key issue here is structural self organization; external control is limited to macroscopic parameters like temperature and pressure, while the desired structure on the particle scale should then form by itself. This chapter reviews, how the early, intermediate, and late stages of sintering are influenced by the presence of grain boundaries, with a special focus on particle sizes in the nanometer range. A new, efficient computer simulation model is presented and its applicability to Ni- and to ITO-particles is briefly discussed.
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