Mg-Containing Hydroxyapatite Coatings Produced by Plasma Electrolytic Oxidation of Titanium

Abstract

Plasma Electrolytic Oxidation (PEO) is promising for the processing of biomaterials because it enables the production of surfaces with adjustable composition and structure. In this work, aimed at the improvement of the bioactivity of titanium, PEO has been used to grow calcium phosphide coatings on titanium substrates. The effects of the addition of magnesium acetate to the electrolytes on the composition of the coatings produced during 120 s on Ti disks using bipolar voltage pulses and solutions of calcium and magnesium acetates and sodium glycerophosphate as electrolytes have been studied. Scanning electron microscopy, X-ray energy dispersive spectroscopy, Rutherford backscattering spectroscopy, X-ray diffractometry with Rietveld refinement and profilometry were used to characterize the modified samples. Coatings composed of nearly 50 % of Mg-doped hydroxyapatite have been produced. In certain conditions up to 4% Mg can be incorporated into the coating without any observable significant structural modifications of the hydroxyapatite.

Investigation of hydroxyapatite (HAP) containing coating on grade 2 titanium alloy prepared by plasma electrolytic oxidation (PEO) at low voltage

“…The most promising implantable metallic biomaterials are titanium and its alloys [1,2] due to its good properties such as high biocompatibility with bone cells and muscle, good corrosion resistance in human body fluid, good mechanical properties, low density, chemical inertness, and no-toxicity [3][4][5]. Titanium and its alloys are often used as materials in the biomedical field [5][6][7][8], especially as orthopaedic and dental implant materials [3,4,[16][17][18]5,[9][10][11][12][13][14][15]. Many investigations have been performed to improve mechanical properties, osseointegration and fixation between bone structures and the implant.…”

“…Hap (Ca 10 (PO 4 ) 6 (OH) 2 ) is a naturally occurring mineral form of calcium apatite and a major mineral component of bones and teeth [10,16,21]. When it is synthetically produced on the surface of ti-tanium, it can promote bioactivity and improve the connection with bone tissue [4,18]. TiO 2 coatings on Ti have also been produced in recent years to improve the corrosion resistance of Ti [18].…”