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Use of Al 4 C 3 for fabrication of alumina–niobium carbide composites by combustion synthesis

Journal of Alloys and Compounds, ISSN: 0925-8388, Vol: 589, Page: 132-136
2014
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Article Description

Alumina–niobium carbide (Al 2 O 3 –NbC and Al 2 O 3 –Nb 2 C) composites were synthesized by incorporating aluminothermic reduction of Nb 2 O 5 into a self-propagating combustion process. Starting materials of this study included Nb 2 O 5, Al, Al 4 C 3 and carbon powders. Experimental evidence indicated that combustion temperature and flame-front velocity decreased with increasing elemental carbon in the reactant mixture. The use of Al 4 C 3 as the source of carbon was demonstrated to prevent carbothermic reduction of Nb 2 O 5. As a result, the combustion exothermicity was increased and phase transformation and product densification were improved. According to the composition analysis, the carbon-free samples composed of Nb 2 O 5 :Al:Al 4 C 3 = 3:2:2 and 3:6:1 successfully produced NbC and Nb 2 C–Al 2 O 3 composites, respectively, with very few minor phases.

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