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Reaction of TiO 2 ‐Al‐C in the Combustion Synthesis of TiC‐Al 2 O 3 Composite
Author(s) -
Choi Yoon,
Rhee ShiWoo
Publication year - 1995
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.1151-2916.1995.tb08426.x
Subject(s) - exothermic reaction , combustion , composite number , materials science , titanium carbide , diffusion , aluminide , chemical engineering , titanium aluminide , titanium , intermetallic , metallurgy , chemistry , composite material , thermodynamics , physics , organic chemistry , alloy , engineering
Reaction mechanisms and the thermal structure in the reaction zone during the combustion of TiO 2 , Al, and C to form TiC‐Al 2 O 3 composite were studied. The reaction between each component was studied and the combustion wave structure and real‐time temperature profile were analyzed. Titanium aluminide species, present in the aluminothermic reduction of TiO 2 , did not occur in the presence of C, because of the high thermodynamic stability of TiC. The activation energies of the exothermic reaction in the 3TiO 2 ‐4Al‐3C system were determined by DSC analysis. This suggests that the combustion reaction is mainly controlled by carbon diffusion through solid TiC. The combustion wave was observed to propagate in an unstable mode. The temperature profiles in the reaction zone were of the sawtooth type and the products were of layered structure.