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This paper reported a novel coating approach to deposit a thin,crack free and nano-structured hydroxyapatite (HA) film on Ti6AI4V alloy with Al_2O_3 buffer layer for biomedical implants.The Al_2O_3 buffer layer was deposited by plasma spraying while the HA top layer was applied by dip coating technique.The X-ray diffraction(XRD) and Raman reflections of alumina buffer layer showedα- toγ-AI_2O_3 phase transformation; and the fractographic analysis of the sample revealed the formation of columnar grains in well melted splats. The bonding strength between Al_2O_3 coating and Ti6AI4V substrate was estimated to be about 40 MPa.The presence of dip coated HA layer was confirmed using XRD,scanning electron microscopy(SEM) and energy dispersive X-ray spectroscopy(EDX) analysis.The SEM images exhibited that HA top layer enveloped homogenously the troughs and crests of the underneath rough(R_a= 2.91 |im) Al_2O_3 surface.It is believed that the novel coating approach adopted might render the implant suitable for rapid cement-less fixation as well as biocompatible for longer periods.
This paper reported a novel coating approach to deposit a thin, crack free and nano-structured hydroxyapatite (HA) film on Ti6AI4V alloy with Al 2 O 3 buffer layer for biomedical implants.The Al 2 O 3 buffer layer was deposited by plasma spraying while the HA top layer was applied by dip coating technique. X-ray diffraction (XRD) and Raman reflections of alumina buffer layer showed α-toγ-AI_2O_3 phase transformation; and the fractographic analysis of the sample revealed the formation of columnar grains in well melted splats. Al 2 O 3 coating and Ti 6 Al 4 V substrate was estimated to be about 40 MPa. The presence of dip coated HA layer was confirmed using XRD, scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX) analysis. SEM images test that HA top layer enveloped homogenously the troughs and crests of the underneath rough (R_a = 2.91 | im) Al_2O_3 surface. It is believed that the novel coating approach adopted might render the imp lant suitable for rapid cement-less fixation as well as biocompatible for longer periods.