Abstract
Magnesium (Mg) alloys are among the promising materials suitable for biodegradable orthopaedic applications. The incorporation of hydroxyapatite (HA) can help in tailoring the bioactivity and biodegradation behaviour of such alloys. Mg-Ca alloys were reinforced with nano-hydroxyapatite (nHA) via stir-casting technique. The composites were metallurgically modified by hot rolling to control the porosity in the microstructure. The rolling increased hardness by 63 %, yield strength by two times, and tensile strength by 79 %. A harmonic composite function approach was used to select the best sample, which was pretreated with nitric acid and dip-coated with sol-gel derived HA. The presence of HA coating enhanced biomineralization and degradation resistance significantly during the initial hours of immersion in simulated body fluid. The HA coating also enhanced the cytocompatibility of L929 cells. It is proposed that such a novel approach can be effectively used for tailoring the degradation rate and bioactivity of Mg-based materials in the physiological environment.
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