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Electrical aspects of the spark-plasma sintering of TiN–TiB2 composite. I. Effect of electrical parameters of spark-plasma sintering on the structure and properties of TiN–TiB2 composite

  • Theory and Technology of Sintering, Thermal and Chemicothermal Treatment
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Powder Metallurgy and Metal Ceramics Aims and scope

The electrical aspects of spark-plasma sintering (SPS) of TiH2–BN and Ti + BN powder mixtures for the production of a TiN–TiB2 ceramic composite material are studied, and the dependence of its properties on direct-current density at the initial stage of sintering is established. To determine the direct-current density, a method for calculating the effective cross-sectional area S eff of the die–sample circuit is proposed. At the initial stage of sintering, the major portion of the current flows through the graphite die because of the resistance of the contacts and the presence of α-BN dielectric. At the final stage of sintering, the current flows mainly through the sintered sample because of the synthesis and densification of the TiN + TiB2 composite and, consequently, the abrupt increases in the conductivity of the sintered sample. Increasing the initial direct-current density during the sintering of TiH x hydride samples leads to an increase in relative density (conductivity), microhardness, fracture toughness, and abrasive wear resistance.

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Authors and Affiliations

  1. Frantsevich Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, Kiev, Ukraine

    A. S. Petukhov, A. V. Ragulya, A. V. Derevyanko, A. M. Kovalchenko & V. V. Starchenko

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  1. A. S. Petukhov
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  2. I. V. Khobta
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  3. A. V. Ragulya
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  4. A. V. Derevyanko
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  5. A. M. Kovalchenko
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  6. V. V. Starchenko
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Correspondence to A. V. Ragulya.

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Translated from Poroshkovaya Metallurgiya, Vol. 50, No. 9–10 (481), pp. 31–42, 2011.

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Petukhov, A.S., Khobta, I.V., Ragulya, A.V. et al. Electrical aspects of the spark-plasma sintering of TiN–TiB2 composite. I. Effect of electrical parameters of spark-plasma sintering on the structure and properties of TiN–TiB2 composite. Powder Metall Met Ceram 50, 596–605 (2012). https://doi.org/10.1007/s11106-012-9365-x

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  • DOI: https://doi.org/10.1007/s11106-012-9365-x

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