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Structural and thermodynamic properties of nanocrystalline Cr3C2–25(Ni20Cr) composite powders produced by high-energy ball milling

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Abstract

Nanostructured coatings have been used to protect components exposed to severe service conditions. High energy milling is widely used to produce nanocrystalline feedstock of coating materials such as chromium carbide and tungsten carbide. This paper presents the structural and thermodynamic properties of Cr3C2–25(Ni20Cr) powders that were high energy milled for different times. During the high energy milling of Cr3C2–25(Ni20Cr) powder, severe plastic deformation takes place. A small part of the energy spent in this process is stored in the crystal lattice as deformation energy. The crystallite size and microstrain in nanocrystalline Cr3C2–25(Ni20Cr) powders milled for different times were determined by X-ray diffraction measurements. Differential scanning calorimetric (DSC) studies of the milled powders revealed a broad transformation, characteristic of a large exothermic reaction in the nanostructured powder. The enthalpy variation measured by DSC permitted determination of the deformation energy stored in the Cr3C2–25(Ni20Cr) powders milled for different times. These measurements also enabled calculation of the specific heat variation of the milled powders.

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Notes

  1. Powders of Cr3C2–25(Ni20Cr) produced in this investigation were used to prepare HVOF-sprayed nanostructured coatings, and these were tested in a custom-designed high temperature erosion–oxidation rig. The results were presented in “Mechanical properties and erosion–oxidation resistance of thermally sprayed nanostructured Cr3C2–25(Ni20Cr) coatings” at the 26th International Surface Modification Technologies, 2012, Lyon, France.

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Authors and Affiliations

  1. Instituto de Pesquisas Energéticas e Nucleares, IPEN-CNEN-SP, Av. Prof. Lineu Prestes 2242, Cidade Universitária, São Paulo, 05508-000, Brazil

    Cecílio A. Cunha, Olandir V. Correa, Nelson B. Lima & Lalgudi V. Ramanathan

  2. Instituto de Geociências da Universidade de São Paulo – USP, Rua do Lago 562, Cidade Universitária, São Paulo, 05508-080, Brazil

    Issac J. Sayeg

Authors
  1. Cecílio A. Cunha
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  2. Olandir V. Correa
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  3. Issac J. Sayeg
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  5. Lalgudi V. Ramanathan
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Correspondence to Lalgudi V. Ramanathan.

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Cunha, C.A., Correa, O.V., Sayeg, I.J. et al. Structural and thermodynamic properties of nanocrystalline Cr3C2–25(Ni20Cr) composite powders produced by high-energy ball milling. J Therm Anal Calorim 126, 1447–1453 (2016). https://doi.org/10.1007/s10973-016-5735-9

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