Abstract
ABSTRACT In the present work, magnesium-calcium deficient nano hydroxyapatite (Mg-CDHA) lamellar composites with 5, 10 and 15 wt. % CDHA of crystallite size 32 nm were produced by ball milling and sintering. The Mg laminas were uniformly covered with CDHA crystals after 20 h of milling as confirmed by transmission electron microscopy. Enhanced biomineralisation was confirmed from X-ray diffraction method for the composites after 72 h of immersion in simulated body fluid (SBF). Degradation studies carried out by weight loss method and electrochemical tests in SBF clearly indicated the increased corrosion resistance for the composites with 10%HA compared to other combinations. The corrosion current values were observed as decreased (1.98 × 10−5 µA/cm2) for Mg-10%HA compared with other composites and pure Mg. Micro-lamellar structure and the deposited mineral phases from the simulated body fluids made the composite with 10% HA as optimum for biodegradable medical scaffold applications.
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