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Mo–Cu pseudoalloys by combustion synthesis and spark plasma sintering

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Abstract

The in situ preparation of Mo–Cu from copper molybdate in the combustion mode with the help of thermo-kinetic coupling approach using the combined magnesium/carbon reducer to provide controllable thermal conditions is reported. To determine the optimum processing parameters, the stepwise nature of reaction mechanism in the CuMoO4–Mg–C system was comprehensively explored with the help of a copper wedge quenching technique combined with X-ray diffraction and microstructural analysis of intermediate and final products. Precursor compositions of CuMoO4(I)–1.2 Mg–2.2C and CuMoO4(II)–1.5 Mg–1.6C reduced at 3 MPa pressure in a temperature range of 1350–1450 °C were found to be the optimal conditions for the combustion formation of Mo–Cu nanocomposite with spherical particles of 50–100 nm in diameter and narrow size distribution. Combustion-synthesized Mo–Cu powders were consolidated by means of spark plasma sintering (SPS) at 1000 °C and pressure of 100 MPa in vacuum. The bulk material has demonstrated twofold enhanced microhardness as compared to microhardness of mechanically alloyed specimens.

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Acknowledgement

The authors gratefully acknowledge the financial support of the State Committee of Science of the Republic of Armenia (Project #13_1D192). This research was also supported by the Estonian Research Council under the personal research grants PUT1063 (I. Hussainova) and MOBJD166 (S. Aydinyan). Authors are greatly acknowledged Dr. Olga Volobujeva (project IUT-T4) and Mr. Rainer Traksmaa for providing SEM and XRD analyses.

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Authors and Affiliations

  1. Laboratory of Kinetics of SHS Processes, A.B. Nalbandyan Institute of Chemical Physics NAS RA, 5/2, P. Sevak Str., 0014, Yerevan, Armenia

    T. Minasyan, H. Kirakosyan, S. Aydinyan & S. Kharatyan

  2. Department of Mechanical and Industrial Engineering, Tallinn University of Technology, 19086, Tallinn, Estonia

    T. Minasyan, S. Aydinyan, L. Liu & I. Hussainova

  3. Department of Inorganic and Analytical Chemistry, Yerevan State University, 1, A. Manoogian Str., 0025, Yerevan, Armenia

    S. Kharatyan

  4. ITMO University, Kronverksky 49, St. Petersburg, Russian Federation, 197101

    I. Hussainova

  5. Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA

    I. Hussainova

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  1. T. Minasyan
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  2. H. Kirakosyan
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  3. S. Aydinyan
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  4. L. Liu
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  5. S. Kharatyan
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  6. I. Hussainova
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Correspondence to I. Hussainova.

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Minasyan, T., Kirakosyan, H., Aydinyan, S. et al. Mo–Cu pseudoalloys by combustion synthesis and spark plasma sintering. J Mater Sci 53, 16598–16608 (2018). https://doi.org/10.1007/s10853-018-2787-1

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  • DOI: https://doi.org/10.1007/s10853-018-2787-1

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