The properties of hydroxyapatite ceramic coatings produced by plasma electrolytic oxidation
Document Type
Article
Publication Date
1-1-2018
Abstract
Calcium phosphate coatings produced on the surface of Ti6Al4V by plasma electrolytic oxidation (PEO) using different concentrations of hydroxyapatite (HA) in a 0.12 M Na3PO4 (NAP) electrolyte solution was investigated. It was found that the amount of calcium phosphate particles infiltrated into the coating layer as well as the thickness and the surface roughness of the coating increased with increasing HA concentration. The porosity of the ceramic coatings indicated an inverse relationship with the concentration of HA particles dispersed in the NAP solution. The result also demonstrates that higher scratch adhesive strength was achieved using 1.5 g/L HA solution, producing a critical load of 2099 mN, while 0 g/L HA only produced a critical load of 1247 mN. The adhesion becomes independent of thickness when the concentration of HA exceeds 1.5 g/L. The failure of the coating was characterized by large periodic hemispherical chipping, while intermittent delamination was noticed with the coating embedded with HA particles. This study demonstrate the viability of using PEO to produce a thin layer of HA ceramic coating on Ti6Al4V suitable for biomedical applications.
Keywords
Plasma electrolytic oxidation, Hydroxyapatite coating, Coating characteristics
Divisions
fac_eng,fac_med
Funders
FRGS grant no. FP056-2015A and PPP grant No. PG186-2016A
Publication Title
Ceramics International
Volume
44
Issue
2
Publisher
Elsevier