Pulsed laser deposition of hydroxyapatite on titanium substrate with titania interlayer |
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Authors: | P Rajesh C V Muraleedharan Manoj Komath Harikrishna Varma |
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Affiliation: | (1) Bioceramics Laboratory, Biomedical Technology Wing, Sree Chitra Tirunal Institute for Medical Sciences and Technology (SCTIMST), Trivandrum, Kerala, 695012, India;(2) Division of Artificial Internal Organs, Biomedical Technology Wing, Sree Chitra Tirunal Institute for Medical Sciences and Technology (SCTIMST), Trivandrum, Kerala, 695012, India; |
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Abstract: | Pulsed laser deposition (PLD) has been used to deposit hydroxyapatite (HA) ceramic over titanium substrate with an interlayer
of titania. PLD has been identified as a potential candidate for bioceramic coatings over metallic substrates to be used as
orthopedic and dental implants because of better process control and preservation of phase identity of the coating component.
However, direct deposition of hydroxyapatite on titanium at elevated temperature results in the formation of natural oxide
layer along with some perovskites like calcium titanate at the interface. This leads to easy debonding of ceramic layer from
the metal and thereby affecting the adhesion strength. In the present study, adherent and stable HA coating over Ti6Al4V was
achieved with the help of an interlayer of titania. The interlayer was made to a submicron level and HA was deposited consecutively
to a thickness of around one micron by exposing to laser ablation at a substrate temperature of 400°C. The deposited phase
was identified to be phase pure HA by X-ray diffraction, scanning electron microscopy, energy dispersive X-ray analysis, and
inductively coupled plasma spectrometry. The mechanical behavior of coating evaluated by scratch test indicates that the adhesion
strength of HA coating was improved with the presence of titania interlayer. |
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