Journal of Dental Research, Vol 60, 59-66, Copyright © 1981 by International & American Associations for Dental Research Online Journals
Correlation between macroscopic porosity location and liquid metal pressure in centrifugal casting technique
T. K. Vaidyanathan, A. Schulman, J. P. Nielsen and S. Shalita
Radiographic analysis of uniform cylindrical castings fabricated by the
centrifugal casting technique has revealed that the macroscopic porosity is
dependent on the location of the sprue attachment to the casting. This is
attributed to the significant pressure gradient associated with the
centrifugal casting technique. The pressure gradient results in different
heat transfer rates at portions of the castings near and away from the free
surface of the button. Consequently, the macroscopic porosity is invariably
at portions of the casting close to the free surface of the button. In
addition, some optimized sprue-reservoir combinations could be predicted
and proved, based on this pressure gradient concept.
