Bio-corrosion behavior and mechanical characteristics of magnesium-titania-hydroxyapatite nanocomposites coated by magnesium-oxide flakes and silicon for use as resorbable bone fixation material

Shahrouz Zamani Khalajabadi, Aminudin Bin Haji Abu, Norhayati Ahmad, Muhammad Azizi Mat Yajid, Norizah Bt Hj Redzuan, Rozita Nasiri, Waseem Haider, Iman Noshadi

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

This study was aimed to improve of the corrosion resistance and mechanical properties of Mg/15TiO2/5HA nanocomposite by silicon and magnesium oxide coatings prepared using a powder metallurgy method. The phase evolution, chemical composition, microstructure and mechanical properties of uncoated and coated samples were characterized. Electrochemical and immersion tests used to investigate the in vitro corrosion behavior of the fabricated samples. The adhesion strength of ~36 MPa for MgO and ~32 MPa for Si/MgO coatings to substrate was measured by adhesion test. Fabrication a homogenous double layer coating with uniform thicknesses consisting micro-sized particles of Si as outer layer and flake-like particles of MgO as the inner layer on the surface of Mg/15TiO2/5HA nanocomposite caused the corrosion resistance and ductility increased whereas the ultimate compressive stress decreased. However, after immersion in SBF solution, Si/MgO-coated sample indicates the best mechanical properties compared to those of the uncoated and MgO-coated samples. The increase of cell viability percentage of the normal human osteoblast (NHOst) cells indicates the improvement in biocompatibility of Mg/15TiO2/5HA nanocomposite by Si/MgO coating.

Original languageEnglish
Pages (from-to)360-374
Number of pages15
JournalJournal of the Mechanical Behavior of Biomedical Materials
Volume77
DOIs
StatePublished - Jan 2018

Keywords

  • Adhesion strength
  • Cell viability
  • Immersion
  • Mg/TiO-based nanocomposite
  • Si/MgO coating
  • UCS

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