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A Novel Method for Direct Synthesis of WC-Co Nanocomposite Powder

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Abstract

In this study, a novel method, termed dielectric-barrier-discharge-plasma (DBDP) assisted ball milling and low-temperature carburization, was used to synthesize WC-Co nanocomposite powder. X-ray diffraction, scanning/transmission electron microscopy, and differential scanning calorimetry were used to characterize the microstructure of powders. Starting from W, Co, and graphite powder mixtures, the DBDP-milled W-C-10Co powder exhibited a flakelike morphology with very fine lamellar structure. The WC-Co composite powder was synthesized at 1273 K (1000 °C), which is much lower than the requisite temperature for the conventional carburizing method. The obtained WC-Co composite powder had a nanocomposite microstructure in which fine WC particles were bounded by homogenously distributed Co phase, and the WC crystals had a slablike morphology with a planar size of about 200 nm and <100-nm thickness. The combinational effect of the milling and the plasma in the DBDP milling caused a unique fine flakelike morphology and high-density interfaces in the W-C-10Co powder mixture, which is responsible for the reduced carburization temperature and the nanocomposite structure of WC-Co powder.

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  1. PHILIPS is a trademark of FEI Company, Hillsboro, OR.

  2. JEOL is a trademark of Japan Electron Optics Ltd., Tokyo.

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Authors and Affiliations

  1. School of Materials Science and Engineering, South China University of Technology, Guangzhou, 510640, P.R. China

    M. Zhu (Professor), X. Y. Bao (Doctoral Student), X. P. Yang (Master Student), N. S. Gu (Master Student), H. Wang (Associate Professor) & M. Q. Zeng (Associate Professor)

  2. Marine Engineering Institute, Jimei University, Xiamen, 361021, P.R. China

    L. Y. Dai (Associate Professor)

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  1. M. Zhu
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  2. X. Y. Bao
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  3. X. P. Yang
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  4. N. S. Gu
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  5. H. Wang
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  6. M. Q. Zeng
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  7. L. Y. Dai
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Correspondence to M. Zhu.

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Manuscript submitted October 23, 2010.

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Zhu, M., Bao, X.Y., Yang, X.P. et al. A Novel Method for Direct Synthesis of WC-Co Nanocomposite Powder. Metall Mater Trans A 42, 2930–2936 (2011). https://doi.org/10.1007/s11661-011-0681-4

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