Effect of fluorine incorporation on long-term stability of magnesium-containing hydroxyapatite coatings

• DOI: 10.1007/s10856-011-4348-x
• Publication Date: 2011-05-25T14:01:54Z
• Authors: Yanli Cai; Sam Zhang; Xianting Zeng; Deen Sun
• Keywords: Fluorine; Chemical Stability; Magnesium fluoride

Dissolution resistance and adhesion strength are two main concerns for long-term stability of surface coated metal implants. In this study, fluorine ions are incorporated into magnesium-containing hydroxyapatite coatings (MgF(y)HA) via sol-gel method to improve the long-term stability of the implants. Surface and interface are studied in terms of phases, depth profiling and chemical bonds by grazing incidence X-ray diffraction, glow discharge optical emission spectroscopy and X-ray photoelectron spectroscopy. The long-term stability is evaluated by dissolution and pull-off test. The results show that fluorine promotes the incorporation of magnesium in HA lattice. The elemental interdiffusion and chemical bonding take place at the coating/substrate interface. Both the dissolution resistance and the adhesion strength are enhanced by fluorine incorporation, thus the long-term stability of the implant is improved.