Tailoring the surface morphology and the crystallinity state of cu-and zn-substituted hydroxyapatites on Ti and Mg-based alloys

Konstantin A. Prosolov, Vladimir V. Lastovka, Olga A. Belyavskaya, Dmitry V. Lychagin, Juergen Schmidt, Yurii P. Sharkeev

Research output: Contribution to journalArticlepeer-review

Abstract

Titanium-based alloys are known as a “gold standard” in the field of implantable devices. Mg-based alloys, in turn, are very promising biocompatible material for biodegradable, temporary implants. However, the clinical application of Mg-based alloys is currently limited due to the rapid resorption rate in the human body. The deposition of a barrier layer in the form of bioactive calcium phosphate coating is proposed to decelerate Mg-based alloys resorption. The dissolution rate of calcium phosphates is strongly affected by their crystallinity and structure. the structure of antibacterial Cu-and Zn-substituted hydroxyapatite deposited by an radiofrequency (RF) magnetron sputtering on Ti and Mg–Ca substrates is tailored by post-deposition heat treatment and deposition at increased substrate temperatures. It is established that upon an increase in heat treatment temperature mean crystallite size decreases from 47 ± 17 to 13 ± 9 nm. The character of the crystalline structure is not only governed by the temperature itself but relies on the condition such as either post-deposition treatment, where an amorphous calcium phosphate undergoes crystallization or instantaneous crystalline coating growth during deposition on the hot substrate. A higher treatment temperature at 700 C results in local coating micro-cracking and induced defects, while the temperature of 400–450 C resulted in the formation of dense, void-free structure.

Original languageEnglish
Article number4449
Pages (from-to)1-20
Number of pages20
JournalMaterials
Volume13
Issue number19
DOIs
Publication statusPublished - 1 Oct 2020

Keywords

  • Annealing
  • Biomaterials
  • Calcium phosphate
  • RF-magnetron sputtering
  • TEM

ASJC Scopus subject areas

  • Materials Science(all)

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