Development of high-quality biocompatible thin film coating method by laser beam and its application to implant materials

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A method using two laser beams, namely the laser-assisted laser ablation (LALA) method, was developed for HAp coating of Ti substrates. This method meets the requirements for a HAp coating on implants, namely, high crystallinity, high adhesion strength, and not exceeding a certain thickness. By controlling the delay time of assist laser irradiation, a strongly-adhering, high-quality HAp coating was obtained. In the present method, crystallization of the deposited HAp is achieved by assist laser irradiation. No additional heat-treatment is required, which prevents oxidation of the substrate. The present method meets all the requirements for a HAp coating mentioned above in a single process. For these reasons, the LALA method can expect as an excellent method for a HAp coating on implants.It has been also achieved to enhance adhesion strength of diamond-like carbon (DLC) thin film on Ti substrate.