Micro-arc oxidation of bioceramic coatings containing eggshell-derived hydroxyapatite on titanium substrate

Qaid, Tawfik Hamood and Ramesh, Singh and Yusof, Farazila and Basirun, Wan Jefrey and Ching, Yern Chee and Chandran, Hari and Ramesh, Subramaniam and Krishnasamy, Sivakumar (2019) Micro-arc oxidation of bioceramic coatings containing eggshell-derived hydroxyapatite on titanium substrate. Ceramics International, 45 (15). pp. 18371-18381. ISSN 0272-8842, DOI https://doi.org/10.1016/j.ceramint.2019.06.052.

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Official URL: https://doi.org/10.1016/j.ceramint.2019.06.052


In the present study eggshells-derived hydroxyapatite (EHA) coatings were successfully produced on Ti6Al4V substrates using micro-arc oxidation process (MAO) at various concentrations of EHA (i.e. 1, 1.5 and 2 g/L) in an electrolyte consisting of tri-sodium orthophosphate. The attributes of the coatings were determine by X-ray diffraction, attenuated total reflectance-fourier transform infrared spectroscopy, field emission scanning electron microscopy and energy dispersive X-ray spectroscopy. The adhesion strength was evaluated using micro scratch tester, while the corrosion behavior of the MAO-coated substrates in phosphate buffer solution was determined by an electrochemical method. The results showed that as the EHA concentration increased, this was accompanied by a reduction in the porosity due to the formation of a dense and thick coating layer. This has also resulted in an increased in the surface roughness and degree of crsytallinity of the HA phase. The MAO-coated substrate prepared with 1.5 g/L EHA concentration exhibited a well-formed coating layer with improved adhesive strength and excellent corrosion resistance. The mechanism of EHA-coating formation as well as the enhanced corrosion resistance of the coated substrates were discussed. This research shows the viability of using calcium-rich waste eggshells to produce phase pure HA suitable for coating on Ti6Al4V substrate using MAO method. © 2019 Elsevier Ltd and Techna Group S.r.l.

Item Type: Article
Funders: University of Malaya: FRGS grant no. FP020-2018A
Uncontrolled Keywords: Eggshells-derived hydroxyapatite; HA; Titanium; Ti6Al4V; Micro-arc oxidation (MAO)
Subjects: Q Science > QC Physics
Q Science > QD Chemistry
R Medicine
T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Engineering
Faculty of Medicine
Faculty of Science > Department of Chemistry
Faculty of Science > Department of Physics
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 11 Feb 2020 02:20
Last Modified: 11 Feb 2020 02:20
URI: http://eprints.um.edu.my/id/eprint/23733

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