Synthesis of ultra-fine Tantalum carbide (cas 12070-06-3) powders by a combinational method of sol–gel and spark plasma sintering

Add time:08/01/2019    Source:sciencedirect.com

Tantalum carbide (cas 12070-06-3) (TaC) nanopowders were synthesized by a novel method combining the sol–gel and spark plasma sintering (SPS) processes using tantalum pentachloride (TaCl5) and phenolic resin as the sources of tantalum (Ta) and carbon (C), respectively. Gels of Ta-containing chelate with good uniformity and high stability were prepared by solution-based processing. The products with the structure of carbon-coated tantalum pentoxide (Ta2O5) were obtained after pyrolysis at 800 °C. Further heat treatment by SPS resulted in the fast formation of TaC at a relatively low temperature. The effects of the C/Ta molar ratio in the raw materials and the heat treatment temperature on the prepared powders were investigated. With increase in the C/Ta molar ratio from 3.75 to 4.25, the synthesis temperature, oxygen content and average crystallite size of the TaC powders decreased. Furthermore, the oxygen content of the powders prepared at the C/Ta molar ratio of 4.25 could be reduce by increasing the heat treatment temperature from 1400° to 1600°C, which unfortunately also induced a mean crystallite size increase from 30 to 100 nm. The TaC powders obtained at a comparatively low C/Ta molar ratios of 4.25 at 1500 °C had an average particle size of about 50 nm and a low oxygen content of about 0.43 wt%.

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