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.
Full text not available from this repository.Abstract
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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