The permeability of Lost Foam pattern coatings for Al alloy castings

  • W. D. Griffiths
  • P. J. Davies


The Lost Foam casting of Al alloys has not yet reached its full potential because of the complexity of the process, and the fact that it is still poorly understood. In this paper, the permeability of typical pattern coatings for the Lost Foam casting of Al was measured, and found to vary from about 0.1 Darcy, (10−13 m2), for a low permeability coating, to about 1 Darcy (10−12 m2), for a high permeability coating. Permeability was reduced by increasing coating thickness, but examination of the coatings on a hot-stage SEM suggested it would be unaffected by increased temperature. The results were used to infer how the filling of a Lost Foam polystyrene pattern could be influenced by the permeability of the pattern coating.


Pattern Coating Increase Coating Thickness Coated Disc Permeability Coating Pattern Interface 
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.



The authors would like to gratefully acknowledge the assistance of Mr. Adrian Caden of the University of Birmingham with the execution of the experiments, Mr. Dennis Nolan of Foseco Morval, Ontario, Canada, for provision of materials, and EPSRC for the provision of a studentship for one of the authors (PJD).


  1. 1.
    Shivkumar S, Wang L, Apelian D (1990) JOM 42:38Google Scholar
  2. 2.
    Martinez OA (1990) AFS Trans 98:241Google Scholar
  3. 3.
    Littleton HE, Miller BA, Sheldon D, Bates CE (1996) AFS Trans 104:335Google Scholar
  4. 4.
    Philipse AP, Schram HL (1991) J Am Ceram Soc 74:728. doi: 10.1111/j.1151-2916.1991.tb06916.x CrossRefGoogle Scholar
  5. 5.
    Massey BS (1995) Mechanics of fluids. Chapman & Hall, LondonGoogle Scholar
  6. 6.
    Darcy H (1856) Les fontaines publiques de la ville de dijon. Victor Dalmont, ParisGoogle Scholar
  7. 7.
    Liu Y, Bakhtiyarov SI, Overfelt RA (2002) J Math Sci 37:2997. doi: 10.1023/A:1016029300243 CrossRefGoogle Scholar
  8. 8.
    Innocentini MDM, Salvini VR, Pandolfelli VC, Coury JR (1999) J Am Ceram Soc 82:1945CrossRefGoogle Scholar
  9. 9.
    Burditt MF (1988) Mod Cast:20Google Scholar
  10. 10.
    Spada AT (2001) Mod Cast:27Google Scholar
  11. 11.
    Kocan GH (1996) AFS Trans 104:565Google Scholar
  12. 12.
    Shivkumar S, Gallois B (1987) AFS Trans 95:801Google Scholar
  13. 13.
    Bex T (1989) Mod Cast:34Google Scholar
  14. 14.
    Shivkumar S, Gallois B (1987) AFS Trans 95:791Google Scholar
  15. 15.
    Yang J, Huang T, Fu J (1998) AFS Trans 106:21Google Scholar

Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  1. 1.Department of Metallurgy and Materials Science, School of EngineeringUniversity of BirminghamEdgbastonUK
  2. 2.Honda of the UK Manufacturing Ltd.SwindonUK

Personalised recommendations