Fabrication of oxide coatings containing bismuth silicate or bismuth titanate on titanium

Oxide coatings formed on titanium in electrolytes with Na2B4O7 or Na2SiO3 by the method of plasma electrolytic oxidation and containing TiO2 or SiO2, respectively, were impregnated in an organic solution of bismuth and, thereafter, annealed in air at 700 °C. As a result, layered oxide coatings conta...

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Bibliographic Details
Published inVacuum Vol. 122; pp. 59 - 65
Main Authors Rudnev, V.S., Vasilyeva, M.S., Medkov, M.A., Nedozorov, P.M., Kilin, K.N.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.12.2015
Subjects
Bi2SiO5
Bi4Ti3O12
Oxide coatings
Titanium
Titanium
Bi4Ti3O12
Oxide coatings
Bi2SiO5
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Summary:Oxide coatings formed on titanium in electrolytes with Na2B4O7 or Na2SiO3 by the method of plasma electrolytic oxidation and containing TiO2 or SiO2, respectively, were impregnated in an organic solution of bismuth and, thereafter, annealed in air at 700 °C. As a result, layered oxide coatings containing, aside from titanium and silicon oxides, crystalline phases of bismuth titanate (Bi4Ti3O12) or silicate (Bi2SiO5) were obtained. The composition and structure of the coatings surface parts and the distribution of bismuth-containing compounds over the surface have been investigated. •Coatings containing TiO2 and Bi4Ti3O12 or Bi2SiO5 on titanium were formed.•The combination of plasma electrolytic oxidation and extraction pyrolysis was used.•Bi4Ti3O12 is present in the coating surface in the form of nanocrystals.•Bi4Ti3O12, TiO2/Ti composites are promising as photocatalysts.
ISSN:0042-207X
1879-2715
DOI:10.1016/j.vacuum.2015.09.010