Structure of Zirconium Alloy Powder Coatings Processed by High Voltage Electric Discharge Consolidation

Authors

  • Evgeny G. Grigoryev,

    1. Key Laboratory for Electromagnetic Field Assisted Materials Processing, Moscow Engineering Physics Institute, Moscow, Russian Federation
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  • Lyuba Yu. Lebedeva,

    1. Key Laboratory for Electromagnetic Field Assisted Materials Processing, Moscow Engineering Physics Institute, Moscow, Russian Federation
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  • Oleg L. Khasanov,

    1. National Research Tomsk Polytechnic University, Tomsk, Russian Federation
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  • Eugene A. Olevsky

    Corresponding author
    1. Key Laboratory for Electromagnetic Field Assisted Materials Processing, Moscow Engineering Physics Institute, Moscow, Russian Federation
    2. National Research Tomsk Polytechnic University, Tomsk, Russian Federation
    3. Powder Technology Laboratory, San Diego State University, San Diego, CA, USA
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  • The support of the Ministry of Science and Education of Russian Federation (grant 11.G34.31.0051) is gratefully appreciated. The support of the San Diego State University researcher by the US Department of Energy, Materials Sciences Division, under Award No. DE-SC0008581 is gratefully acknowledged. The support of the National Research Tomsk Polytechnic University is gratefully acknowledged.

Abstract

Zirconium alloy powders (Zr + 1% Nb) of spherical and flake forms have been consolidated by high voltage electric discharge processing. The consolidation enabled the fabrication of coatings on ceramic and metallic substrates as well as of freestanding powder components. The experimental dependence of the electric conductivity of the powders of spherical shape and flake shape on the applied pressure has been investigated. The influence of the current pulse amplitude on the final density of the consolidated zirconium powder alloy coatings on ceramic and metallic substrates and of the produced free-standing powder samples has been analyzed for different applied pressures. The maximum amplitude of the electric current density above, which the consolidation process is unstable and has a nature of blowout has been determined. The conducted metallographic analysis showed the preservation of the microstructure of initial powder particles after the process of high voltage electric discharge consolidation.

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