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Synthesis of submicrocrystalline TiCx–Al2O3 composites by mechanically-activated pressure-assisted self-propagating high-temperature synthesis technique

Published online by Cambridge University Press:  31 January 2011

V. Gauthier ,
A.V. Khitev ,
V.A. Shcherbakov ,
M.F. Beaufort ,
P. Villechaise  and
S. Dubois
V. Gauthier*
Affiliation:
Laboratoire de Métallurgie Physique [UMR 6630 Centre National de la Recherche Scientifique (CNRS)], 86962 Futuroscope-Chasseneuil du Poitou, France
A.V. Khitev
Affiliation:
Institute of Structural Macrokinetics and Materials Science, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432 Russia
V.A. Shcherbakov
Affiliation:
Institute of Structural Macrokinetics and Materials Science, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432 Russia
M.F. Beaufort
Affiliation:
Laboratoire de Métallurgie Physique [UMR 6630 Centre National de la Recherche Scientifique (CNRS)], 86962 Futuroscope-Chasseneuil du Poitou, France
P. Villechaise
Affiliation:
Laboratoire de Mécanique et de Physique des Matériaux [UMR 6617 Centre National de la Recherche Scientifique (CNRS)], Ecole Nationale Supérieure de Mécanique et d’Aérotechnique (ENSMA), 86961 Futuroscope-Chasseneuil du Poitou, France
S. Dubois
Affiliation:
Laboratoire de Métallurgie Physique [UMR 6630 Centre National de la Recherche Scientifique (CNRS)], 86962 Futuroscope-Chasseneuil du Poitou, France
*
a)Address all correspondence to this author. e-mail: veronique.gauthier@univ-poitiers.fr
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Abstract

TiCx–Al2O3 composites have been synthesized by pressure-assisted combustion synthesis of (Ti + C + Al2O3) reactant powder. Different alumina contents (10–40 vol%) have been investigated to study the dilution effect on TiC microstructure. A mechanical method and a mixed chemical/mechanical method have been used to obtain (Ti + C + Al2O3) powder mixtures with different alumina distributions. Scanning electron microscopy (SEM) observations of these mixtures show that alumina is distributed inside micrometric (Ti + C) aggregates for the first method whereas alumina is located around (Ti + C) aggregates for the second one. X-ray diffraction (XRD) and SEM analyses of the composites indicate that TiCx is substoichiometric in carbon and mainly consists of submicrometric grains. A distribution of Al2O3 inside (Ti + C) aggregates is more efficient to reduce TiC grain size. For the 40 vol% Al2O3 diluted (Ti + C) mixture prepared from the mechanical route, TiCx nanocrystallites have been successfully stabilized, which demonstrates that the addition of Al2O3 diluent in a (Ti + C) mixture can be efficiently used to inhibit grain growth.

Keywords

Combustion synthesis (SHS)MicrostructureComposite
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 10 , October 2007 , pp. 2700 - 2710
Copyright
Copyright © Materials Research Society 2007

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References

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