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Metallurgical and Materials Transactions A

, Volume 29, Issue 1, pp 377–385 | Cite as

Dynamic analysis of unidirectional pressure infiltration of porous preforms by pure metals

  • Dhiman K. Biswas
  • Jorge E. Gatica
  • Surendra N. Tewari
Article

Abstract

Unidirectional pressure infiltration of porous preforms by molten metals is investigated numerically. A phenomenological model to describe fluid flow and transport phenomena during infiltration of fibrous preforms by a metal is formulated. The model describes the dynamics of the infiltration process, the temperature distribution, and solid fraction distribution. The numerical results are compared against classical asymptotic analyses and experimental results. This comparison shows that end effects may become important and render asymptotic results unreliable for realistic samples. Fiber volume fraction and initial temperature appear as the factors most strongly influencing infiltration. Metal superheating affects not only the length of the two-phase zone but also the solid fraction distribution in the two-phase zone. The effect of constant applied pressure, although significant on the infiltration velocity, is almost negligible on the two-phase zone length and on solid fraction distribution. When the initial preform temperature is below the metal melting point, and constant pressure is applied under adiabatic conditions, the flow ceases when sufficient solidification occurs to obstruct it. A comparison with literature experiments proves the model to be an efficient predictive tool in the analysis of infiltration processes for different preform/melt systems.

Keywords

Material Transaction Solid Fraction Void Fraction Darcy Number Metal Melting Point 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© ASM International & TMS-The Minerals, Metals and Materials Society 1998

Authors and Affiliations

  • Dhiman K. Biswas
    • 1
  • Jorge E. Gatica
    • 2
  • Surendra N. Tewari
    • 2
  1. 1.Comsys, Information Technology ServicesRaleigh
  2. 2.the Department of Chemical EngineeringCleveland State UniversityCleveland

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