Studies of Ta, Al, and Carbon Sources on Combustion Synthesis of Alumina–Tantalum Carbide Composites

Alumina–tantalum carbide (Al2O3–TaC and Al2O3–Ta2C) composites were synthesized by incorporating aluminothermic reduction into a self-propagating combustion process. The test specimens adopted were composed of Ta2O5, Al, Al4C3, and carbon powders. Experimental evidence showed that the use of Al4C3 to provide Al and carbon decreased combustion exothermicity and hindered Ta2O5 from being fully reduced. In contrast, for the formation of Al2O3–TaC and Al2O3–Ta2C composites, Al4C3-free samples with molar ratios of Ta2O5:Al:C = 3:10:6 and 3:10:3, respectively, exhibited the highest combustion temperature and reaction rate in the self-propagating high-temperature synthesis process and yielded products with very few minor phases.

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