Kinetics of Pressureless Infiltration of Al-Mg Melts into Porous Alumina Preforms
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- Patro, D. & Jayaram, V. Metall and Materi Trans B (2008) 39: 108. doi:10.1007/s11663-007-9111-9
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Effective “hydrodynamic” radii governing infiltration kinetics of reactive Al-Mg melts into alumina preforms were found to be three orders of magnitude smaller than the average pore size of the packed bed and also smaller compared with the kinetics for a nonreactive system. A sinusoidal capillary model was developed to predict flow kinetics within the packed bed. For the reactive system, two factors were ascribed for additional melt retardation: (1) different intrinsic wettabilities of the two liquids on alumina, thereby leading to significantly different “effective” local contact angles; and (2) local solute depletion from the meniscus, which was incorporated as a time-dependent contact angle.