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Combustion synthesis of ultrafine tungsten carbide powder

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Abstract

The synthesis of ultrafine tungsten carbide (WC) powder has been investigated from a WO3 + Mg + C mixture via combustion technique. The values of combustion parameters were estimated over the Mg concentration range 3 to 16 mol. Fast increasing tendency of the WC/W2C phase ratio from Mg concentration has been found in the final products. Phase pure WC was prepared with more than 10 mol Mg, and a small amount of ammonium carbonate (or urea) was blended with the WO3+ C mixture. The effects of the combustion conditions on product morphology and composition were evaluated using scanning electron microscopy and x-ray diffraction analysis. The results of the investigation indicate that carbon-containing compounds significantly enhance the combustion synthesis process; leading to higher conversion efficiencies and phase pure WC formation at 1500–1550 °C. The crystalline particles of WC showed a narrow distribution in particle size, with a mean diameter around 200 nm. The results are discussed in the context of gas-phase and solid-phase transport models.

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Acknowledgment

This research was supported by the Program for the Training of Graduate Students in Regional Innovation which was conducted by the Ministry of Commerce Industry and Energy of Korean Government.

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Authors and Affiliations

  1. Rapidly Solidified Materials Research Center (RASOM), Chungnam National University, Yuseong, Daejeon, 305-764, Korea

    H.I. Won, H.H. Nersisyan & C.W. Won

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  1. H.I. Won
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  2. H.H. Nersisyan
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  3. C.W. Won
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Correspondence to H.I. Won.

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Won, H., Nersisyan, H. & Won, C. Combustion synthesis of ultrafine tungsten carbide powder. Journal of Materials Research 23, 2393–2397 (2008). https://doi.org/10.1557/jmr.2008.0289

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  • DOI: https://doi.org/10.1557/jmr.2008.0289

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