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Nanograined WC-Co Composite Powders by Chemical Vapor Synthesis

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Abstract

Nanograined tungsten carbide (WC)–Co composite powders were prepared by a chemical vapor synthesis (CVS) process that has previously been used for preparing the aluminides of titanium and nickel and other metallic and intermetallic powders at the University of Utah. To determine the optimum condition for producing nanograined WC-Co composite powders, the effects of carburization temperature, CH4 to WCl6 ratio, CH4 to H2 ratio, CoCl2 contents, and residence time of WC on the powder composition and particle size were investigated. The reduction and carburization of the vaporized chlorides by CH4-H2 mixtures produced nanograined WC and Co composite powder, which sometimes contained small levels of W2C, W, or the η (Co3W3C) phase. The presence of these incompletely carburized phases can be tolerated because they can be fully carburized during the subsequent sintering process. These phases can also be fully carburized by a separate post-treatment. The products were characterized by using X-ray diffraction (XRD) and a transmission electron microscope (TEM). As a result, nanograined WC-Co composite with the particle size less than 30 nm was obtained.

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Acknowledgments

This material is based upon work supported by the United States Department of Energy under Award No. DE-FC36-04GO14041, with cost sharing by Kennametal and Smith International and technical collaboration with Idaho National Laboratory. The authors extend special thanks to Messrs. Rick Riley and Tim Webb, Kennametal, for the chemical analysis of powders, and Dr. Anthony Griffo, Smith International, for his helpful suggestions.

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Author notes

  1. Gilsoo Han (Associate Professor)

    Present address: School of Materials, Mechanical & Automation Engineering, Yanbian Univerisity of Science and Technology, Beishan St, Yanji City, Jilin Province, P.R. China, 133000

  2. Young-Ugk Kim (Senior Researcher)

    Present address: Samsung SDI Co. Ltd, Gyeonggi-do, Korea, 447-731

  3. M. Mena (Process Engineer)

    Present address: FS Precision Tech, LLC, Rancho Dominguez, CA, 90221, USA

Authors and Affiliations

  1. Department of Metallurgical Engineering, University of Utah, Salt Lake City, UT, 84112, USA

    Taegong Ryu (Graduate Student), H.Y. Sohn (Professor), Gilsoo Han (Associate Professor), Young-Ugk Kim (Senior Researcher), Kyu Sup Hwang (Graduate Student), M. Mena (Process Engineer) & Zhigang Z. Fang (Associate Professor)

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  1. Taegong Ryu
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  2. H.Y. Sohn
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  3. Gilsoo Han
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  4. Young-Ugk Kim
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  5. Kyu Sup Hwang
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  6. M. Mena
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  7. Zhigang Z. Fang
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Corresponding author

Correspondence to H.Y. Sohn.

Additional information

Manuscript submitted June 22, 2007.

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Ryu, T., Sohn, H., Han, G. et al. Nanograined WC-Co Composite Powders by Chemical Vapor Synthesis. Metall Mater Trans B 39, 1–6 (2008). https://doi.org/10.1007/s11663-007-9115-5

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  • DOI: https://doi.org/10.1007/s11663-007-9115-5

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