Abstract
Ultra-fine hafnium carbide powder was synthesized by the carbothermal reduction of HfO2 at 1600°C using the modified spark plasma sintering (SPS) apparatus. The synthesized powder had a fine particle size of about 125nm and a low oxygen content of below 0.5wt%. The purity of the powder was >99.9% excluding Zr, and 99.6% when including Zr impurity. The intermediate reactions and particle growth were minimized due to the low synthesis temperature, fast heating/cooling rate and the effect of current during the modified SPS process. A relatively large amount of HfC powder could be synthesized by the new synthesis method (>175g/day). HfC ceramics with high relative density (>96%) were obtained after sintering the synthesized powder without sintering additives at 2300°C for 30min under 100MPa pressure by SPS. The average grain size of the obtained specimen was about 6μm.
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