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

通过优化激光成形工艺参数，制备了具有不同蜂窝孔尺寸的蜂窝结构抗压强度试样（Ti-6Al-7Nb）。孔径为600μm的蜂窝结构抗压强度为68 ~ 302 MPa；18g /cm^3的密度。这些值大致相当于人类股骨的抗压强度为21-170 MPa， 2。密度为00 g/cm^3。在生物相容性培养的成骨细胞中，细胞在培养初期呈六角形取向，21天后观察细胞向六角形孔内生长。此外，在较小的蜂窝孔尺寸（300μm）中，整个区域都形成了网状细胞生长。这意味着较小的蜂窝孔尺寸可以促进细胞向蜂窝孔内生长，也就是说，激光成形技术可能非常可靠地用于制造生物医疗设备。

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.