Metallurgical and Materials Transactions B

, Volume 30, Issue 5, pp 933–944

Reactive infiltration of silicon melt through microporous amorphous carbon preforms

Authors

  • P. Sangsuwan
    • 3M Thailand Limited
  • S. N. Tewari
    • the Department of Chemical EngineeringCleveland State University
  • J. E. Gatica
    • the Department of Chemical EngineeringCleveland State University
  • M. Singh
    • NYMA, Inc.Lewis Research Center Group
  • R. Dickerson
    • Los Alamos National Laboratories
Article

DOI: 10.1007/s11663-999-0099-1

Cite this article as:
Sangsuwan, P., Tewari, S.N., Gatica, J.E. et al. Metall and Materi Trans B (1999) 30: 933. doi:10.1007/s11663-999-0099-1

Abstract

The kinetics of unidirectional capillary infiltration of silicon melt into microporous carbon preforms has been investigated as a function of the pore morphology and melt temperature. The infiltrated specimens showed alternating bands of dark and bright regions, which corresponded to the unreacted free carbon and free silicon regions, respectively. The decrease in the infiltration front velocity for increasing infiltration distances is in qualitative agreement with the closed-form solution of capillarity-driven fluid flow through constant-cross-section cylindrical pores. However, drastic changes in the thermal response and infiltration front morphologies were observed for minute differences in the preform’s microstructure. This suggests the need for a dynamic percolation model that would account for the exothermic nature of the silicon-carbon chemical reaction and the associated pore-closing phenomenon.

Copyright information

© ASM International & TMS-The Minerals, Metals and Materials Society 1999