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Synthesis of vanadium and chromium carbides (V8C7–Cr3C2) nanocomposite via an in situ precursor method

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Abstract

In situ synthesis method was used to prepare V8C7–Cr3C2 nanocomposite. Ammonium vanadate, ammonium dichromate and nanometer carbon black were used as raw materials. The products were characterized by X-ray diffractometry (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermogravimetric and differential scanning calorimetry (TG-DSC) and X-ray photoelectron spectroscopy (XPS) techniques. The results show that V8C7–Cr3C2 nanocomposite with an average crystallite size of 25.4 nm can be synthesized at 1200 °C for 1 h. The synthesis temperature required by the method is at least 200 °C lower than that required by the conventional approaches for preparing vanadium and chromium carbides. The powders show good dispersion and are mainly composed of spherical or nearly spherical particles with a mean diameter of about 30 nm. The weight loss ratio of the precursor throughout the reaction process reaches 58 wt%. Three exothermic peaks and four endothermic peaks occur during the reaction. The surface of the specimen is mainly composed of V, Cr, C and O elements.

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Acknowledgments

This study was financially supported by the National Natural Science Foundation of China (No. 51304063), the Funding Scheme for Young Teachers of Higher School in Henan Province (No. 2013GGJS-076) and the Fundamental Research Funds for the Henan Provincial Colleges and Universities (No. 2014YWQQ19).

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Authors and Affiliations

  1. College of Materials Science and Engineering, Henan University of Technology, Zhengzhou, 450001, China

    Zhi-Wei Zhao, Wen-Meng Hu, Hong-Juan Zheng & Fei-Xiao Chen

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  1. Zhi-Wei Zhao
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  2. Wen-Meng Hu
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  3. Hong-Juan Zheng
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  4. Fei-Xiao Chen
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Correspondence to Zhi-Wei Zhao.

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Zhao, ZW., Hu, WM., Zheng, HJ. et al. Synthesis of vanadium and chromium carbides (V8C7–Cr3C2) nanocomposite via an in situ precursor method. Rare Met. 34, 498–504 (2015). https://doi.org/10.1007/s12598-015-0501-x

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  • DOI: https://doi.org/10.1007/s12598-015-0501-x

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