Abstract
The interparticle force due to capillary action of a liquid contact between two solid spheres is shown rigorously to have two contributions, one the surface tension force itself and the other due to the pressure difference caused by surface curvature. Numerical means are used to solve for the shape of the liquid surface and to evaluate this interparticle force as a function of contact angle, volume of liquid, size of sphere, and surface tension. The rigorous solution is then compared to the often-used circle approximation. We also evaluate the effect of neglecting one of the terms in the force equation, as is sometimes done in the literature. The general force relations are then used to draw several practical conclusions concerning liquid-phase sintering of spherical powders.
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