Abstract
Sintering studies between 700 and 800°C in air and in argon were conducted using spherical silver powder. The technique of three-dimensional replication of the pore structure of silver powder samples has proved a precise means for measuring the sintering parameters, neck size and curvature, for calculation of theoretical neck growth and shrinkage rate. A neck growth model gave a close correlation with measured neck size after sintering in air, showing the important contribution of surface and grain boundary diffusion to neck growth. Grain boundary diffusion was found to be the dominant mechanism for densification in the initial stage of sintering in air of spherical silver powder. However, the experimental data obtained after sintering in argon disagreed with both the neck growth model (based on surface and grain boundary diffusion) and the densification model (based on grain boundary diffusion). The important effect of sintering atmosphere is discussed in terms of its interaction with solute impurities in the silver powder.
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