Reactive Infiltration of Silicon Melt Through Microporous Amorphous Carbon PreformsMetallurgical and Materials Transactions B: Physical Metallurgy and Materials Science
AbstractThe 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.
Publisher's StatementCopyright 1999 ASM International. This paper was published in Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science, Vol. 30, Issue 5, pp. 933-944 and is made available as an electronic reprint with the permission of ASM International. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplications of any material in this paper for a fee or for commercial purposes, or modification of the content of this paper are prohibited.
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Citation InformationSangsuwan, P; Tewari, SN; Gatica, JE; Singh, M; Dickerson, R. (1999). Reactive Infiltration of Silicon Melt Through Microporous Amorphous Carbon Preforms. Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science 30, 933-944.