Abstract
Previous experiments indicated that the contact angles required for spontaneous infiltration of molten metal alloys into particulate ceramic preforms are significantly less than 90°. Analysis of capillarity in pores between packed particles shows the origin of this effect to be in the non-cylindrical curvature of these pore surfaces. A simple geometrical approach for predicting critical contact angles, θc, for spontaneous infiltration of non-cylindrical pores is presented and applied to the pore structure between closepacked spheres. Although the critical contact angle for entry of the first layer of pores varies with the direction of infiltration, complete spontaneous infiltration of the structure is limited by penetration of the tetrahedral pores, for which θc = 50.7°.
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