Natural Hydroxyapatite Diopside Research Paper

Natural Hydroxyapatite-Diopside (NHA-Di) nanocomposite as an excellent bio-ceramic coating for titanium implants
Amirsalar Khandan1, Majid Abdellahi2, Reza Vatankhah Barenji1, Neriman Ozada1, Ebrahim Karamian2
1Mechanical Engineering department, Eastern Mediterranean University, North Cyprus, Gazimağusa, TRNC,Mersin 10 Turkey
2 Department of Materials Engineering, Najafabad Branch, Islamic Azad University, Isfahan, Iran Corresponding author: Majid Abdellahi; Email: [e-mail]
Abstract
In the present study the deposition of nanostructured NHA-Di (Natural Hydroxyapatite-Diopside) composite coatings on the surface of Ti–6Al–4V implants was studied. The effect of electrophoretic deposition (EPD) voltage, Di content and process temperature

The polished specimens were investigated by the optical microscopy to ensure the absence of pits or scratches on the surface. Ti electrodes in size of 10×10×2 mm3 were mechanically polished with a sequence of SiC papers (60 and 1000 grit) followed by the application of 1 μm diamond paste to get a scratch free surface finish. Moreover, a typical sample after polishing was etched in acid (40%HF, 10%HNO3, and 50%H2O). The Ti electrodes then were ultrasonically washed in acetone for several minutes, and dried. Surface morphologies of Ti–6Al–4V substrate polished with 60, 1000 SiC grit and acid etched are shown in Fig.

8) of the NHA-Di coating surface roughness after its deposition on Ti alloy specimen surfaces. a)10wt.%, b)20wt.% and c)30 wt.% of Di
Figure 9:The SEM images of the cross section (after coating and sintering at 850 °C)show that the coated sample with 50 V after 10 min has a better morphology than that of 60 V and 12 min (Fig.10a).Cracking is seen in the sample containing 30wt.% Di which was coated at 60 V and 12 min (Fig. 10b).
Figure 10 : TEM photomicrograph has been obtained from the nanopowders in the coated sample
Figure 11: the coating samples of a) NHA-30wt.%Di and b) NHA-0wt.%Di after adhesion test
Figure 12: Hertz stress and surface roughness variations versus Di