Metallurgical and Materials Transactions B

, Volume 39, Issue 1, pp 108–115

Kinetics of Pressureless Infiltration of Al-Mg Melts into Porous Alumina Preforms

Authors

    • Department of Materials EngineeringIndian Institute of Science
    • Material Mechanics LabJohn F. Welch Technology Center, General Electric
  • Vikram Jayaram
    • Department of Materials EngineeringIndian Institute of Science
Article

DOI: 10.1007/s11663-007-9111-9

Cite this article as:
Patro, D. & Jayaram, V. Metall and Materi Trans B (2008) 39: 108. doi:10.1007/s11663-007-9111-9

Abstract

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.

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© THE MINERALS, METALS & MATERIALS SOCIETY and ASM INTERNATIONAL 2007