Role of excess Al on the combustion reaction in the Al-TiO2-C system

Of various systems that utilize a self-propagating high-temperature synthesis, the Al-TiO 2 -C system is representative of in-situ production of metal matrix composites reinforced with TiC and Al 2 O 3 . Contrary to common understanding, however, the following reaction 4Al + 3TiO 2 + 3C→3TiC + 2Al 2...

Full description

Saved in:
Bibliographic Details
Published in:Metals and materials international 2014, 20(6), , pp.1151-1156
Main Authors: Kim, Je-Woo, Lee, Jung-Moo, Lee, Joon-Ho, Lee, Jae-Chul
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemistry and Materials Science
Engineering Thermodynamics
Heat and Mass Transfer
Machines
Magnetic Materials
Magnetism
Manufacturing
Materials Science
Metallic Materials
Processes
Solid Mechanics
재료공학
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Of various systems that utilize a self-propagating high-temperature synthesis, the Al-TiO 2 -C system is representative of in-situ production of metal matrix composites reinforced with TiC and Al 2 O 3 . Contrary to common understanding, however, the following reaction 4Al + 3TiO 2 + 3C→3TiC + 2Al 2 O 3 is infeasible in the Al-TiO 2 -C system with the given stoichiometric composition of 4Al + 3TiO 2 + 3C. Experiments have shown that the formation of TiC and Al 2 O 3 is feasible only in an Al-TiO 2 -C system that contains a certain amount of excess Al. In this study, the mechanism of the reactions in the Al-TiO 2 -C system was elucidated in order to explain why excess Al is needed to promote the formation of TiC and Al 2 O 3 . We also estimated the amount of excess Al that is necessary to promote the complete transformation of the Al-TiO 2 -C powders to TiC and Al 2 O 3 .
ISSN:1598-9623
2005-4149
DOI:10.1007/s12540-014-6020-8