Abstract
Nano-sized zirconium carbide powder was synthesized at 1600°C by the carbothermal reduction of ZrO2 using a modified spark plasma sintering (SPS) apparatus. The synthesized ZrC powder had a fine particle size of approximately 189nm and a low oxygen content of 0.88wt%. The metal basis purity of the synthesized powder was 99.87%. The low synthesis temperature, fast heating/cooling rate and the effect of current during the modified SPS process effectively suppressed the particle growth. Using the synthesized powder, monolithic ZrC ceramics with high relative density (97.14%) were obtained after the densification at 2100°C for 30min at a pressure of 80MPa by SPS. The average grain size of the densified ZrC ceramics was approximately 9.12μm.
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