Investigation of zirconia tetragonal phase coatings formed by plasma electrolytic oxidation

13th International Conference on Films and Coatings

Savushkina, S.V.^1 ; Ashmarin, A.A.^1 ; Apelfeld, A.V.^2 ; Borisov, A.M.^2 ; Vinogradov, A.V.^2 ; Polyansky, M.N.^1 ; Bogdashkina, N.L.^3

Keldysh Research Center, Onezhskaya str. 8, Moscow

125438, Russia^1

Moscow Aviation Institute (National Research University), Volokolamskoe sh. 4, Moscow

125993, Russia^2

Institute of Physical Chemistry and Electrochemistry of RAS, Leninsky pr., 31-4, Moscow

119991, Russia^3

关键词: Elemental compositions;    Nanoparticles additives;    Plasma electrolytic oxidation;    Superficial layers;    X-ray microanalysis;    Yttrium silicates;    Zirconia coatings;    Zirconia tetragonal phase;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/857/1/012037/pdf
DOI  :  10.1088/1742-6596/857/1/012037

来源: IOP

【 摘 要 】

Zirconia coatings were formed on zirconium-niobium alloy (1 % Nb) by plasma electrolytic oxidation (PEO) in silicate-hypophosphite electrolyte with Y2O3nanopowder additives. The structure, elemental composition and layer-by-layer phase composition of the PEO coatings were investigated using methods of scanning electron microscopy (SEM), X-ray microanalysis, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS). PEO coatings formed in an electrolyte with 6 g/L Y2O3nanoparticles additive contain predominantly tetragonal t-ZrO2phase and have the superficial layer mainly consisting of electrolyte components and their compounds, including yttria and yttrium silicate. Moreover, stabilization of the t-ZrO2phase in the PEO coating leads to increase its hardness up to 4.6 GPa.