The main purpose of this paper is to investigate mechanical properties of thin films of strontium carbonate (Sr2CO3) doped with hydroxyapatite (HA) on titanium substrates using nanoindentation techniques. The variation in the weight percentages of strontium carbonate of 0 wt %, 2.5 wt % and 100 wt % of Sr2CO3 in hydroxyapatite on a titanium substrate were used to investigate the effect of strontium carbonate on the surface modification for biological application. The hope is to use these results to improve the surface hardness of dentures and boost cavity prevention, and to improve menopause bone loss and help in its remodeling. The hardness and elastic moduli of different weight percents of variation in the compositions of strontium carbonate in Sr2CO3 - HA thin film layers deposited at 600 °C on titanium substrates using Pulse Laser Deposition (PLD) at high vacuum of 10−6 Torr were measured. The effect of varying Sr2CO3 in HA on the crystallinity, on the microstructure and on film thickness was determined using X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM) and stylus profilometer respectively. The Sr2CO3 - HA with the composition of 2.5 wt. % of Sr2CO3 has average film thicknesses of each composition of the film were also recorded and a hardness performance of 3.89 GPa, good peak broadening was also observed in the 2.5 wt % composition Sr2CO3 using XRD. The variations in the composition of strontium Carbonate in Hydroxyapatite in term of hardness and elastic moduli were reported.

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