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Home » Research » Publications

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Degradation behavior of the MgO/HA surface ceramic nano-composites in the simulated body fluid and its use as a potential bone implant

V. Khalili, J. Frenzel, G. Eggeler

Materials Chemistry and Physics, 258, 123965, (2021)

DOI: 10.1016/j.matchemphys.2020.123965

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In this work, we studied the effects of hot isostatic pressing and surface anodizing on the behavior of an in-situ surface modified magnesium matrix nano-composite with different wt.% of hydroxyapatite by stir-centrifugal casting. The hot isostatic pressing and anodizing were conducted to reduce the defects and to replace the surface of Mg/HA with a ceramic matrix nano-composite layer of MgO/HA, respectively. The composition of the conversion layer of anodizing was evaluated using energy dispersive spectroscopy and X-ray diffraction. The electrochemical tests were conducted in the simulated body fluid. The results show that the dominant deposition is vertical Mg(OH)2 nano-rods on the hot isostatic pressed-anodized surface during immersion in the simulated body fluid. According to the electrochemical results, a homogeneous distribution of 1.8 wt% nano-hydroxyapatite in the magnesium oxide matrix with a well-arranged nanostructure on the surface, after hot isostatic pressing and anodizing, reduces the H2 release and corrosion rate. Also, the mentioned specimen demonstrates the lowest thermodynamic tendency for corrosion (−1.345 V) and the corrosion rate of 3.8388 mm × year−1 with the highest protection efficiency of 42.26% compared to the as-cast pure magnesium. Therefore, it can be considered as a promising material in designing biomedical bone implants.

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{"type":"article", "name":"v.khalili20211", "author":"V. Khalili and J. Frenzel and G. Eggeler", "title":"Degradation behavior of the MgO/HA surface ceramic nanocomposites in the simulated body fluid and its use as a potential bone implant", "journal":"Materials Chemistry and Physics", "volume":"258", "OPTnumber":"", "OPTmonth":"1", "year":"2021", "OPTpages":"123965", "OPTnote":"", "OPTkey":"In-situ surface modifying; stir-centrifugal casting; anodizing; ceramic nano-composites of MgO/HA; simulated body fluid", "DOI":"10.1016/j.matchemphys.2020.123965"}
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