RESEARCH ON HOW TO CONTROL THE POROSITY OF THE MEDICAL IMPLANTS MADE BY SELECTIVE LASER MELTING TECHNOLOGY

Răzvan PACURAR, Ancuta PACURAR, Adrian Sever RADU

Abstract


The article presents a series of researches that were performed for the first time in Romania, in the field of customized medical implants made by using the Selective Laser Melting (SLM) technology. Several samples were manufactured from TiAl6Nb7 material on the MCP Realizer SLM 250 equipment at the Technical University of Cluj-Napoca.  Theoretical and experimental methods for determining the porosity of the metallic samples are also presented within the article. The connection between the lens positions of the optical system from the SLM machine and the resulted porosity within the internal structure of the material has been analyzed by using the Scanning Electron Microscope (SEM) images and ImageJ software. The samples were tested at traction in order to determine how the porosity is influencing other important material characteristics, such as the fracture strength resistance and the elongation at break. Actually, at the end, as demonstrated, by using the optimum lens position of the SLM machine, the fracture strength resistance and the elongation of the material, will not be significantly influenced, as compared to the values of these characteristics specified by the producer of the TiAl6Nb7 material.

Key words: Additive Manufacturing, Selective Laser Melting, Customized Medical Implants, Titanium

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