Approaching the structure-property relationship of sintered metal nano/microparticles from the perspective of the agglomerate size effect.

In this study, we explore the structure-property relationship of sintered metal nano/microparticles from the perspective of the agglomerate size effect. Through sintering experiments and mechanical tests of Cu particle pastes with different solvents, a linear correlation between the agglomerate size in the particle paste (L a) and the size of large-scale cavities in the sintered structure (L c) is revealed, and a negative correlation between the cavity size and the shear strength of the sintered structure is discovered. Based on these results, a quantitative model is proposed to predict the overall strength of the sintered structure (τ f). A relationship τ f = τ c /(1 + √(2 L cmax / d)) is established, which fits the experimental results very well. The model reveals that the relative agglomerate size (L a / d) or relative cavity size (L c / d) plays a more important role than the particle size (d) itself in terms of defining the final sintering properties of metal nano/microparticles. [Display omitted] • The structure-property relation of sintered metal particles is explored • A linear correlation between agglomerate size and sintered cavity size is revealed • The cavity size and shear strength follow a relation of τ c / 1 + 2 L cmax / d • The relative cavity size (L c / d) is the key to determining the strength [ABSTRACT FROM AUTHOR]