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Synthesis of nanostructured WC-12 pct Co coating using mechanical milling and high velocity oxygen fuel thermal spraying

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Abstract

A nanostructured WC-12 pct Co coating was synthesized using mechanical milling and high velocity oxygen fuel (HVOF) thermal spraying. The variation of powder characteristics with milling time and the performance of the coatings were investigated using scanning electron microscope (SEM), X-ray, transmission electron microscope (TEM), thermogravimetric analyzer (TGA), and microhardness measurements. There is no evidence that indicates the presence of an amorphous phase in the sintered WC-12 pct Co powder, and the binder phase in this powder is still crystalline Co. Mechanical milling of up to 20 hours did not lead to the formation of an amorphous phase in the sintered WC-12 pct Co powder. During the initial stages of the milling, the brittle carbide particles were first fractured into fragments and then embedded into the binder phase. This process gradually formed polycrystal nanocomposite powders of the Co binder phase and W carbide particles. The conventional cold welding and fracturing processes primarily occurred among the Co binder powders and polycrystal composite powders. The nanostructured WC-12 pct Co coatings, synthesized in the present study, consist of an amorphous matrix and carbides with an average particle diameter of 35 nm. The coating possesses an average microhardness of 1135 HV and higher resistance to indentation fracture than that of its conventional counterpart.

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Authors and Affiliations

  1. the Department of Chemical and Biochemical Engineering and Materials Science, University of California, 92697-2575, Irvine, CA

    Jianhong He (Postdoctoral Scientist), Michael Ice (Graduate Student) & Enrique J. Lavernia (Professor and Chair)

  2. the Carderock Division, Naval Surface Warfare Center, 20817-5700, West Bethesda, MD

    Steven Dallek (Research Chemist)

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  1. Jianhong He
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  2. Michael Ice
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  3. Enrique J. Lavernia
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  4. Steven Dallek
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He, J., Ice, M., Lavernia, E.J. et al. Synthesis of nanostructured WC-12 pct Co coating using mechanical milling and high velocity oxygen fuel thermal spraying. Metall Mater Trans A 31, 541–553 (2000). https://doi.org/10.1007/s11661-000-0289-6

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  • DOI: https://doi.org/10.1007/s11661-000-0289-6

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