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Tribological and physical-mechanical properties of protective coatings from Ni-Cr-B-Si-Fe/WC-Co-Cr before and after fission with a plasma jet

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Abstract

A new type of coating is developed, which is a mechanical mixture of two different powders, namely, Ni-Cr-B-Si-Fe (PG-19N-01) and WC-Co (hard alloy). After the coatings from this mixture are deposited, their surface layer is fused with a plasma jet using an eroding electrode made of W. The additional treatment of the coatings with the plasma jet yields new phases and causes the redistribution of elements in the layer 45–60 μm deep; the percentage ratio of the phases WC, α-CoCr, Co, and Ni, as well as Cr3Ni2 + γ-(Fe, Ni) appearing during coating deposition also changes. The redistribution of elements occurs in the upper coating layer owing to fusion with the plasma jet. These processes yield variations in the physical-mechanical properties of the coatings, such as the hardness and elastic modulus; the coating wear rate decreases severalfold. It is found that with increasing load applied to the Berkovich pyramid the elastic modulus of the coating drops from 240 (at an indentation depth of 50 nm) to 175 GPa (at 150 nm). The elastic modulus of the substrate rises from 25 to 42 GPa. The coating hardness calculated from the loading-unloading curves is 15.3 to 10.6 GPa under increased load applied to the indentor. Specimens covered with the coating fused with the plasma jet in three passes demonstrate the lowest material wear.

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Authors and Affiliations

  1. Sumy State University, ul. Rimskogo-Korsakova 2, Sumy, 40007, Ukraine

    A. D. Pogrebnyak, S. N. Bratushka, M. V. Il’yashenko, A. V. Pshik & M. V. Kaverin

  2. Sumy Istititute for Surface Modification, ul. Rimskogo-Korsakova 2, Sumy, 40007, Ukraine

    A. D. Pogrebnyak, S. N. Bratushka, M. V. Il’yashenko, A. V. Pshik & M. V. Kaverin

  3. Samarkand Branch of Tashkent University of Informatics, Samarkand, Uzbekistan

    N. A. Makhmudov

  4. Paton Institute of Electric Welding, National Academy of Sciences of Ukraine, ul. Bozhenko 11, Kiev, 30650, Ukraine

    O. V. Kolisnichenko & Yu. N. Tyurin

  5. Belarus State University, pr. Nezavisimosti 4, Minsk, 220030, Belarus

    V. V. Uglov

Authors
  1. A. D. Pogrebnyak
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  2. S. N. Bratushka
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  3. M. V. Il’yashenko
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  4. N. A. Makhmudov
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  5. O. V. Kolisnichenko
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  6. Yu. N. Tyurin
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  7. V. V. Uglov
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  8. A. V. Pshik
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  9. M. V. Kaverin
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Correspondence to A. D. Pogrebnyak.

Additional information

Original Russian Text © A.D. Pogrebnyak, S.N. Bratushka, M.V. Il’yashenko, N.A. Makhmudov, O.V. Kolisnichenko, Yu.N. Tyurin, V.V. Uglov, A.V. Pshik, M.V. Kaverin, 2011, published in Trenie i Iznos, 2011, Vol. 32, No. 2, pp. 122–130.

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Pogrebnyak, A.D., Bratushka, S.N., Il’yashenko, M.V. et al. Tribological and physical-mechanical properties of protective coatings from Ni-Cr-B-Si-Fe/WC-Co-Cr before and after fission with a plasma jet. J. Frict. Wear 32, 84–90 (2011). https://doi.org/10.3103/S1068366611020085

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  • DOI: https://doi.org/10.3103/S1068366611020085

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