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Composition, surface structure, and thermal behavior of ZrO2 + TiO2/Ti and ZrO2 + CeO x + TiO2 composites formed by plasma-electrolytic oxidation

  • Nanoscale and Nanostructured Materials and Coatings
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Abstract

Specific surface structures of ZrO2 + TiO2 (I) and ZrO2 +CeOx + TiO2 (II) coatings on titanium before and after annealing at 850°C for 24 h in air are studied. Whiskers are found on the surface of type-I coatings before annealing, and perfectly edged crystals composed of TiO2 and ZrO2 oxides are found upon annealing. Pores in both coatings have a multilevel structure. In the case of type-I coatings, orifices of pores are covered with titanium. In type-II coatings, pore orifices contain titanium, zirconium, and oxygen. Oxygen deficiency implies that titanium and zirconium are present in pore orifices in metallic state. In type-II coatings, the surface distribution of cerium is heterogeneous. Mechanical treatment of the annealed coatings causes their exfoliation from the substrate metal. In the case of both coatings, the exfoliating surfaces are composed of TiO2 blocks containing excess oxygen.

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Authors and Affiliations

  1. Institute of Chemistry, Far Eastern Branch, Russian Academy of Sciences, pr. 100-letiya Vladivostoka 159, Vladivostok, 690022, Russia

    V. S. Rudnev, I. V. Malyshev, I. V. Lukiyanchuk & V. G. Kuryavyi

  2. Far Eastern Federal University, Sukhanova str., 8, Vladivostok, 690950, Russia

    V. S. Rudnev & V. G. Kuryavyi

Authors
  1. V. S. Rudnev
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  2. I. V. Malyshev
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  3. I. V. Lukiyanchuk
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  4. V. G. Kuryavyi
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Correspondence to V. S. Rudnev.

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Original Russian Text © V.S. Rudnev, I.V. Malyshev, I.V. Lukiyanchuk, V.G. Kuryavyi, 2012, published in Fizikokhimiya Poverkhnosti i Zashchita Materialov, 2012, Vol. 48, No. 4, pp. 391–397.

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Rudnev, V.S., Malyshev, I.V., Lukiyanchuk, I.V. et al. Composition, surface structure, and thermal behavior of ZrO2 + TiO2/Ti and ZrO2 + CeO x + TiO2 composites formed by plasma-electrolytic oxidation. Prot Met Phys Chem Surf 48, 455–461 (2012). https://doi.org/10.1134/S207020511203015X

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  • DOI: https://doi.org/10.1134/S207020511203015X

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