Study On The Biomedical Applications Of Ti6Al4V Parts Fabricated By Selective Laser Melting

Titanium and its alloys are extensive used in clinical medicine, play a big role on the treatment of human body skeleton, tissues, organs etc as implant materials. Titanium and its alloys are new medicinal carrier materials with high technology content and high value. Compared with other materials, titanium and its alloy have excellent mechanical compatibility and biocompatibility. While, in the long-term clinical application,Titanium and its alloys present barely satisfactory performances of biocompatibility,mechanical compatibility and security problem etc. The material will appear the phenomenon of “ stress shielding ” in the receptors because of the mechanical properties of the material itself, Titanium and its alloys have low modulus of elasticity,but still higher than our body tissue. The researchers put forward the idea of connected pore structure to improve this problem. But, The shape and forming quality of parts are difficult to meet the requirements of actual clinical implants by the traditional processing methods.Selective laser melting technology is one of the latest development of rapid prototyping technology, can be used to shape metal powder, without being limited by the parts shape. In this paper, pore structure parts shaped by selective laser melting technology to verify SLM ability to form complex hole, analyzing the mechanical properties and biological applications of pore structure. Details are as follows:1) The research on surface roughness of TC4 parts shaped by SLM. Titanium and its alloys insert in the receptor, the surface will directly interact with the organization of the receptor, the implant surface properties will directly decided to receptor cells adhesion, proliferation and differentiation on it, and ultimately decide the quality of cell growth and implant success. The surface roughness of parts fabricated by SLM with different process parameters and forming angle, analyzed the influence of surface roughness with different forming process, the influence of surface morphology,microstructure and the surface roughness of the parts in clinical application.2) The research on feasibility of porous complex parts by SLM. We try to verify the ability of selective laser melting to form porous complex parts by shaped samples with 200μm、300μm、400μm、500μm and 600μm strut width, analyze the effect and quality of parts, analyze the reason of the defects such as glue powders and cracks.3) The analysis of mechanical properties of pore structure by selective laser meltingtechnology. We measure the mechanical properties of cubic unit structure by the static compression experiment, analyze the effect of different strut width on the mechanical properties and change law between strut width and mechanical properties. The elastic modulus and ultimate strength of the samples increase with the increasing of strut width.The existence of holes can significantly reduce the elastic modulus of TC4, improve the biomechanical compatibility of TC4. Finally, the results of simulation were compared with experimental parts, hope to obtained mechanical properties of array type hole parts through the finite element method, finite element method is introduced for later development of array type porous parts and mechanical properties were obtained through the finite element method new porous unit to predict its mechanical properties.