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Structural-Phase State, Elastic Stress, and Functional Properties of Nanocomposite Coatings Based on Amorphous Carbon

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Abstract

The paper analyzes the microstructure and phase state of magnetron-sputtered nanocomposite Ti-C-Ni-Cr coatings based on Ni- and Cr-doped amorphous carbon by transmission electron microscopy, scanning electron microscopy, and X-ray diffraction. The analysis shows that the coating structure comprises an amorphous carbon matrix and nanosized TiC and Ni particles with relatively low lattice bending-torsion (no greater than 75° µm−1) and with much lower local internal stress compared to its value in superhard coatings. The microhardness of such coatings on VT1-0 titanium alloy is H = 14 GPa, and their friction coefficient is µ < 0.2. The coating structure and properties are stable to annealing up to T = 700°C. After annealing at T = 900°C, the coating surface reveals TiO, Ti2O, and other oxide phases. The results of scratch testing show that the character and the scale of fracture in the coatings depend on the substrate hardness: on soft substrates, the coatings experiences intense cracking and delamination, and on hard alloy substrates, they undergo multifragmented fracture. The coatings on hard alloy substrates survive up to a load of 80 N.

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Funding

The work was performed under Fundamental Research Program of the State Academies of Sciences for 2013–2020 (direction 111.23). The equipment was provided by the Tomsk Materials Center for Collective Use (TSU) and Nanotech Shared Use Center (ISPMS SB RAS).

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Authors and Affiliations

  1. National Research Tomsk State University, Tomsk, 634050, Russia

    A. D. Korotaev, I. Yu. Litovchenko & S. V. Ovchinnikov

  2. Institute of Strength Physics and Materials Science, Siberian Branch, Russian Academy of Sciences, Tomsk, 634055, Russia

    A. D. Korotaev, I. Yu. Litovchenko & S. V. Ovchinnikov

Authors
  1. A. D. Korotaev
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  2. I. Yu. Litovchenko
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  3. S. V. Ovchinnikov
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Correspondence to A. D. Korotaev.

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Russian Text © The Author(s), 2018, published in Fizicheskaya Mezomekhanika, 2018, Vol. 21, No. 5, pp. 82–89.

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Korotaev, A.D., Litovchenko, I.Y. & Ovchinnikov, S.V. Structural-Phase State, Elastic Stress, and Functional Properties of Nanocomposite Coatings Based on Amorphous Carbon. Phys Mesomech 22, 488–495 (2019). https://doi.org/10.1134/S1029959919060055

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  • DOI: https://doi.org/10.1134/S1029959919060055

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