Pulsed-laser deposition scheme (PLD) is one of feasible coating methods and we applied this method to hydroxyapatite coating on medical implants. Our previous study showed that ablated droplets disturbed to coat dense, high purity, and high crystallinity hydroxyapatite layer at low annealing temperature. Therefore, we applied “eclipse-type” PLD scheme, which could capture ablated droplets by an obstacle ball and only tiny particles as atoms, ions, and molecules were deposited on a substrate. Raman spectrum from the coating layer showed coating layer changed to crystal layer over 360 ℃, and as increase the annealing temperature crystallinity became better. The adhesion strength of the coating layer was also measured by a scratched test. As increasing of the annealing temperature, the adhesion also became strength stronger. We concluded this high-quality coating layer is suitable for medical implants coating.
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