The structure of an rf-magnetron sputter-deposited silicate-containinghydroxyapatite-based coating investigated by high-resolution techniques

Maria A. Surmeneva, Marina V. Chaikina, Vladimir I. Zaikovskiy, Vladimir F. Pichugin, Volker Buck, Oleg Prymak, Matthias Epple, Roman A. Surmenev

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57 Citations (Scopus)

Abstract

A biocompatible nanostructured silicate-containing hydroxyapatite-based (Si-HA) thin coatingwas deposited by radio-frequency (RF) magnetron sputtering on silicon and titanium substrates. The morphology of the Si-HA coating was pore-free, dense and followed the topography of the underlying substrates. Energy-dispersive X-ray spectroscopy (EDX) gave molar Ca/P and Ca/(P+Si) ratios of 1.78 and 1.45, respectively. According to XRD-analysis, the coatingwas nanocrystallinewith a crystallite size in the range of 10-50 nm. The ultrastructure of the coating was analyzed by high-resolution transmission electron spectroscopy (HRTEM) combinedwith fast Fourier transform (FFT) analysis. The average crystallite size calculated by the Rietveld method was in good agreement with the HRTEM results. Moreover, HRTEM-observations indicated the presence of atomic layer misorientations originating from imperfections between the nanocrystals in the coating. The average coating nanohardness (11.6±1.7 GPa) was significantly higher than that of the uncoated Ti substrate (4.0±0.3 GPa), whereas no significant difference between the Young'smodulus of the coating (125±20 GPa) and the substrate (115±10 GPa) was found. Immersion of the coated substrates in simulated body fluid (SBF) led to the deposition of an apatite layer.

Original languageEnglish
Pages (from-to)39-46
Number of pages8
JournalSurface and Coatings Technology
Volume218
Issue number1
DOIs
Publication statusPublished - 1 Jan 2013

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Keywords

  • Calcium phosphate
  • Coating
  • Implant
  • Nanocomposite
  • RF-magnetron sputtering
  • Silicate

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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