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Oxidation resistance of a SiC–ZrB2 coating prepared by a novel pack cementation on SiC-coated graphite

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Abstract

In this study, a functionally graded SiC layer was prepared on a graphite substrate by a pack cementation method with Si, C, and Al2O3 powders. Then a SiC–ZrB2 coating was developed by an in situ reaction method through a novel pack cementation technique at 1873 K with Zr, Si, and B4C powders to improve the oxidation protection ability of SiC-coated graphite. The phase compositions, microstructure, and element distribution of the coating were identified by X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy, respectively. The isothermal oxidation test of the coated samples was accomplished at 1773 K in air for 10 h. According to the results, a 550-μm thick graded C–SiC layer was detected at the graphite–coating interface and a SiC–ZrB2 coating was formed on the first coating. The SiC–ZrB2 coating could efficiently enhance oxidation resistance of graphite with a mass gain of +1.1 %, as compared with a −1.2 % mass loss of the first step coating. The excellent protection ability of SiC–ZrB2 coating could be ascribed to the high thermally stable ZrSiO4.

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Authors and Affiliations

  1. Faculty of Materials and Manufacturing Technology, Malek-Ashtar University of Technology, Tehran, Iran

    Jalil Pourasad, Naser Ehsani & Zia Valefi

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  1. Jalil Pourasad
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  2. Naser Ehsani
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  3. Zia Valefi
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Correspondence to Jalil Pourasad.

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Pourasad, J., Ehsani, N. & Valefi, Z. Oxidation resistance of a SiC–ZrB2 coating prepared by a novel pack cementation on SiC-coated graphite. J Mater Sci 52, 1639–1646 (2017). https://doi.org/10.1007/s10853-016-0457-8

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  • DOI: https://doi.org/10.1007/s10853-016-0457-8

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