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Nitridation of chromium powder in ammonia atmosphere

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Abstract

CrN powder was synthesized by nitriding Cr metal in ammonia gas flow, and its chemical reaction mechanism and nitridation process were studied. Through thermodynamic calculations, the Cr-N-O predominance diagrams were constructed for different temperatures. Chromium nitride formed at 7002-1200°C under relatively higher nitrogen and lower oxygen partial pressures. Phases in the products were then investigated using X-ray diffraction (XRD), and the Cr2N content varied with reaction temperature and holding time. The results indicate that the Cr metal powder nitridation process can be explained by a diffusion model. Further, Cr2N formed as an intermediate product because of an incomplete reaction, which was observed by high-resolution transmission electron microscopy (HRTEM). After nitriding at 1000°C for 20 h, CrN powder with an average grain size of 63 nm was obtained, and the obtained sample was analyzed by using a scanning electron microscope (SEM).

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Authors and Affiliations

  1. Nano-Science and Technology Research Center, Shanghai University, Shanghai, 200444, China

    Ling Li, Qiang Zhen & Rong Li

  2. School of Materials Science and Engineering, Shanghai University, Shanghai, 200444, China

    Qiang Zhen

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  1. Ling Li
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  2. Qiang Zhen
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  3. Rong Li
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Correspondence to Qiang Zhen or Rong Li.

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Li, L., Zhen, Q. & Li, R. Nitridation of chromium powder in ammonia atmosphere. Int J Miner Metall Mater 22, 319–324 (2015). https://doi.org/10.1007/s12613-015-1076-0

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  • DOI: https://doi.org/10.1007/s12613-015-1076-0

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