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Thermodynamic analysis of thermite reactions for synthesizing Ni-based alloys

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Abstract

The equilibrium compositions of a thermite reaction system (Fe2O3+Cr2O3+CrO3+NiO+O2+N2+TiO2+C+S+CaO+Al), which was used to prepare Ni-based alloys, were predicted by means of the free energy minimization method. The effects of the reactant contents on the equilibrium compositions and the adiabatic temperature of the thermite reaction system were analyzed. The microstructure of the Ni-based alloys was investigated. The thermodynamic analysis indicated that the products of the thermite reaction system contained primarily Al2O3, Fe, Ni, Cr, Ni3Al and NiAl, due to impurities C, N2 and S in the raw materials, there could also exist TiC, Cr7C3, CrN, CaS and TiN in the equilibrium products. The amount of Ni3Al and NiAl in the products increased with increase of the aluminum content in the starting materials. The microstructure investigation showed that the Ni-based alloys consisted of austenite, ferrite, Ni3Al and NiAl. The existence of Ni3Al and NiAl in the Ni-based alloys reconciled with the predictions of thermodynamic analysis, suggesting the free energy minimization method is useful in designing advanced materials with multiple components by thermite reaction technique.

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Acknowledgement

This work was financially supported by National Natural Science Foundation of China (NSFC), Grant No.50472100.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing, 100083, P.R. China

    Wenjun Xi, Chaoli Ma, Huiping Duan & Tao Zhang

  2. Department of Materials Science and Engineering, Tsinghua University, Beijing, 100083, P.R. China

    Heping Zhou

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  1. Wenjun Xi
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  2. Heping Zhou
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  3. Chaoli Ma
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  4. Huiping Duan
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  5. Tao Zhang
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Correspondence to Wenjun Xi.

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Xi, W., Zhou, H., Ma, C. et al. Thermodynamic analysis of thermite reactions for synthesizing Ni-based alloys. J Mater Sci 42, 8489–8495 (2007). https://doi.org/10.1007/s10853-007-1752-1

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  • DOI: https://doi.org/10.1007/s10853-007-1752-1

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