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Journal of Materials Science

, Volume 54, Issue 22, pp 13863–13873 | Cite as

Preparation and crystal structure of ζ-Cr2(C,N) powders

  • Shiqing Ma
  • Ying LiuEmail author
  • Jinwen Ye
  • Lei Xie
Ceramics
  • 156 Downloads

Abstract

In this work, the influence parameters, including synthesis temperature, nitrogen pressure, and isothermal dwell time, were systematically investigated during carbothermal preparation of ζ-Cr2(C,N) solid solution powders by using thermogravimetry differential scanning calorimetry, X-ray diffraction, scanning electron microscope, and composition analysis. The results showed that Cr2O3 began to be carbonized at ~ 1000 °C firstly and then was nitrided with the formation of Cr2(C,N) at elevated temperature, and finally ζ-phase Cr2(C,N) particles were obtained at the optimal condition of 1200 °C for 1 h under the N2 pressure of 0.02 MPa, which showed lowest oxygen (0.82 wt%) and highest nitrogen (6.25 wt%) content with the diameter of ~ 3 μm. Increasing temperature, N2 pressure, and dwell time facilitates the reduction of oxygen. However, these parameters must be carefully controlled under reasonable ranges to preventing quality deterioration. In addition, the crystal structure of ζ-Cr2(C,N) was characterized by transmission electron microscope and neutron powder diffraction (NPD). Based on the selected area diffraction and NPD patterns, the crystal structure of Cr2(C,N), prepared in this work, was confirmed to be orthorhombic (Pbcn) as well as the interstitial atoms (C and N) were ζ-type occupational ordering.

Notes

Acknowledgements

This work was supported by the National Key Research and Development Program of China (2017YFB0305900), the National Natural Science Foundation of China (51804202), the Science and Technology Research Program of Sichuan Province (2016GZ0237), the Natural Science Foundation of Hebei Province (E2019210295), and the Science and Technology Foundation of Higher Education Institutions of Hebei Province (QN2018043). We also thank the Institute of Nuclear Physics and Chemistry CAEP for providing the neutron beam time.

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© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.School of Materials Science and EngineeringShijiazhuang Tiedao UniversityShijiazhuangChina
  2. 2.School of Materials Science and EngineeringSichuan UniversityChengduChina
  3. 3.Key Laboratory of Advanced Special Material and TechnologyMinistry of EducationChengduChina
  4. 4.Institute of Nuclear Physics and ChemistryCAEPMianyangChina

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