Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5464496 | Surface and Coatings Technology | 2017 | 22 Pages |
Abstract
The structure and composition of ceramic coatings formed by plasma electrolytic oxidation (PEO) of Zr-1% Nb alloy under AC conditions in silicate-hypophosphite electrolyte with additives of yttria nanopowder have been analyzed by scanning electron microscopy, X-ray microanalysis and XRD analysis. The yttria nanopowder in electrolyte leads to formation of additional thin superficial layer enriched in conglomerates of Y2O3 nanoparticles. The yttria leads to inhibition of low-temperature m-ZrO2 phase in PEO coating. After addition of 6Â g/L yttria nanopowder in the electrolyte only t-ZrO2 phase was found in the coating surface layer. The excess part of Y2O3 nanoparticles is not involved in the PEO process of zirconia formation and remains in the PEO coatings in the form of inclusions.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Nanotechnology
Authors
A.V. Apelfeld, A.A. Ashmarin, A.M. Borisov, A.V. Vinogradov, S.V. Savushkina, E.A. Shmytkova,