Date of Award

2013

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Mechanical Engineering

First Advisor

Waters, Dr. Cynthia Kornegay

Abstract

The main purpose of the research is to investigate the corrosion rate and mechanical properties of thin film of strontium carbonate (Sr2CO3) doped with hydroxyapatite (HA) on titanium substrates using DC Corrosion of Potentiodynamic and Nanoindentation respectively. The variation in the weight percentages of strontium carbonate in hydroxyapatite on a titanium substrate was used to investigate the beneficial effect of strontium on surface modification in biological application such as to improve hardness of dentures and prevention of cavities, menopause bone loss and enhancement of remodeling. The corrosion rate, 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 ºC 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 morphology changes in the composition, on the microstructure and on film thickness was determined using X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM) and profilometer respectively. The Sr2CO3 - HA with the composition of 2.5 wt. % of Sr2CO3 was found to have good corrosion property with corrosion rate of less than 20 mpy, the average film thicknesses of each composition of the film were also recorded and a favorable hardness performance of 3.89 GPa, good peak broadening was also observed in the 2.5 wt % composition Sr2CO3 using XRD. The variation in the composition of strontium in Hydroxyapatite, corrosion rate, hardness and elastic moduli were reported.

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