Abstract
Using a modified spark plasma sintering apparatus, nano-tantalum carbide powder was synthesized at 1450°C by the carbothermal reduction of Ta2O5. The synthesized TaC powder had ultra-fine particle size of 62nm and a low oxygen content of about 0.5wt%. The metal basis purity of the synthesized powder was 99.94%. The particle growth during synthesis was effectively suppressed by using the modified spark plasma sintering process due to the low synthesis temperature and fast heating/cooling rate. Dense monolithic TaC ceramics were obtained by sintering the synthesized powder without sintering additives at 2200°C for 30min under 80MPa pressure. The average grain size of the dense TaC ceramics was 4μm.
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