Correlations between reaction wave propagation and phase formations in combustion of diluted TiO₂–Al–C mixture

Authors: Saw, L. H.¹; Rahbari, R. G.²; Hamdi, M.¹; Yahya, R.³

Source: Materials Research Innovations, Volume 13, Number 3, September 2009 , pp. 171-175(5)

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Abstract:

The influence of Al₂O₃ diluent on quasi-adiabatic combustion synthesis of (3TiO₂+4Al+3�5C+yAl₂O₃) mixture in the presence of oxygen was studied. Assuming adiabatic conditions, maximum temperature of the system for y=0, 0�5, 1�0, 1�5, 2�0, and 2�5 was calculated. Activation energy of reaction kinetics was thermoanalytically determined based on thermogravimetric analysis. Boundary between steady/unsteady wave propagations in self-sustaining (SS) mode of combustion was determined for various amounts of diluents. Existing models proposed in combustion kinetics were used to relate propagation modes of combustion wave to activation energy and conversion rate. The examined model was successfully corresponded to additional phase formations in the product.

Keywords: COMBUSTION SYNTHESIS; ACTIVATION ENERGY; SELF-SUSTAINING MODE; DILUENT

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/143307509X437536

Affiliations: 1: Department of Engineering Design and Manufacture, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia 2: Department of Engineering Design and Manufacture, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia;, Email: rahbarg@gmail.com 3: Department of Chemistry, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia

Publication date: 2009-09-01

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