Challenge for Fabrication of Medical Devices using Next Generation' s Ti Alloy Powders by Laser Forming

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Honeycomb structured compression strength specimens(Ti-6Al-7Nb) which have various honeycomb hole sizes were fabricated in optimizing the process parameters of laser forming. The honeycomb structure with hole diameter of 600μm showed 68-302 MPa in compression strength and 2. 18 g/cm^3 in density. Those values are approximately equal to that of human femur which has 21-170 MPa in compression strength and 2. 00 g/cm^3 in density. In the case of osteobalsts culturing for biocompitability, the cells were oriented in hexagonal shape at the early stage of culturing, and after 21 days the cells growing into the hexagonal shaped holes were observed. In addition, in smaller honeycomb hole size(300μm), network cell growth was formed over the entire area. This means that smaller honeycomb hole size promotes the cell growing into the honeycomb hole, in another word, the laser forming technique might be very reliable to fabricate bio-medical devices.