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Chemical Instability of Silicon Carbide in the Presence of Transition Metals
Author(s) -
Pan Yi,
Baptista João L.
Publication year - 1996
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.1151-2916.1996.tb08932.x
Subject(s) - cobalt , nickel , transition metal , eutectic system , materials science , silicon carbide , carbide , silicon , carbon fibers , metal , metallurgy , inorganic chemistry , chemistry , alloy , catalysis , composite material , biochemistry , composite number
SiC has been proved chemically unstable at temperatures >1073 K (800°C) in the presence of cobalt, nickel, or iron. The instability results from reactions of cobalt, nickel, or iron with SiC to produce silicides and free carbon. A method of calculation is proposed for thermodynamic analyses of these reactions. The results show that the silicides of cobalt, nickel, and iron are thermodynamically more stable than SiC. The metal–silicon eutectic may provide kinetic condition to the reactions. Calculations also are performed for reactions of SiC with other transition metals. Instabilities of SiC in the presence of those metals are predicted.