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Intrinsic Reaction and Self‐Diffusion Kinetics for Silicon Carbide Synthesis by Rapid Carbothermal Reduction
Author(s) -
Johnson Jacob A.,
Hrenya Christine M.,
Weimer Alan W.
Publication year - 2002
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2002.tb00447.x
Subject(s) - carbothermic reaction , silicon carbide , diffusion , materials science , kinetics , carbide , aerosol , silicon , chemical engineering , thermodynamics , chemistry , composite material , metallurgy , physics , organic chemistry , quantum mechanics , engineering
A one‐dimensional nonisothermal model has been developed for the “rapid carbothermal reduction” synthesis of fine silicon carbide powders. Intrinsic reaction and self‐diffusion kinetics are identified through simulation of the model and comparison to experimental results. The reaction rate follows a shrinking‐core mechanism and is described by the relation [formula omitted] The self‐diffusion coefficient for SiC in the aerosol flow reactor is described by the relationThe self‐diffusion coefficient for SiC in the aerosol flow reactor is described by the relation