Facile in-situ combustion synthesis of TiC reinforced aluminum matrix composites

A.M. Nabawy, K.A. Khalil, A.M. Al-Ahmari
King Saud University, SA

Keywords: combustion synthesis, TiC, aluminum matrix, HFIHS

Summary:

Using high frequency induction heat-assisted combustion synthesis (HFIHACS) as a facile manufacturing methods followed by combustion in tube furnace under inert gas, composites of TiC reinforced aluminum matrix have been in-situ synthesized directly from elemental powders of aluminum, titanium and calcium carbonate. The potential application of combustion synthesis of TiC reinforced aluminum matrix composites was systematically investigated. First stage, Aluminum and Titanium powders are blended with calcium carbonate, CaCO3 in a designated amount to obtain 30Vol% of TiC. As the mixture is heated up to certain elevated temperature using high heating rate (700 C/min) by using HFIHS, the calcium carbonate is dissociated into carbon dioxide gas, CO2, and calcium oxide, CaO. The carbon dioxide gas, in turn, dissociates and carbon particles form. In the second stage, the compacts are then introduced into the tube furnace with argon atmosphere. The elevated temperature used was high enough to allow the TiC particles to be formed in-situ as result of an exothermic reaction between titanium and carbon and between titanium aluminide and carbon. The TiC particles obtained have a spherical shape with a particle sized in the range of 100nm to 5µm.