Synthesis of Porous Titanium with Directional Pores by Selective Laser Melting
Takayuki Nakamoto*, Nobuhiko Shirakawa*, Kyosuke Kishida**,
Katsushi Tanaka**,***, and Haruyuki Inui**
*Technology Research Institute of Osaka Prefecture, 2-7-1 Ayumino, Izumi-shi, Osaka 594-1157, Japan
**Department of Materials Science and Engineering, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
***Department of Mechanical Engineering, Kobe University, Nada-ku, Kobe 657-8501, Japan
There has been a growing interest and practical importance in producing implants such as artificial joints, bone fixators and spinal fixators with titanium. In order to achieve good bone/implant fixation while avoiding the problem of bone absorption, it is mandatory to reduce the Young’s modulus of titanium while keeping the high strength so as to achieve the compatibility in these mechanical properties with human cortical bone. We have tried to fabricate porous titanium with directional pores by the use of the method based on Selective Laser Melting (SLM), in which complex three-dimensional parts even containing designed shapes of pores can be produced by sintering successive thin layers of metal powder with a laser beam. Here we show that porous titanium with directional pores aligned in the longitudinal direction of the ingot is successfully produced through the use of the SLM process and that high strength and low modulus comparable to those of human bone are simultaneously achieved when these properties are measured in the longitudinal direction of the ingot.
Katsushi Tanaka, and Haruyuki Inui, “Synthesis of Porous Titanium with Directional Pores by Selective Laser Melting,” Int. J. Automation Technol., Vol.6, No.5, pp. 597-603, 2012.
-  M. Long and H. J. Rack, “Titanium alloys in total joint replacementa materials science perspective,” Biomaterials, Vol.19, pp. 1621-1639, 1998.
-  N. Niinomi, “Mechanical biocompatibilities of titanium alloys for biomedical applications,” J. Mech. Behav. Biomed. Mater., I, pp. 30-42, 2008.
-  M. E. O’Sullivan, E. Y. Chao, and P. J. Kelly, “The Effects of Fixation on Fracture-Healing,” J. Bone Joint Surg., Vol.71, pp. 306-310, 1989.
-  C. E. Wen, M. Mabuchi, Y. Yamada, K. Shimojima, Y. Chino, and T. Asahina, “Processing of biocompatible porous Ti and Mg,” Scr. Mater., Vol.45, pp. 1147-1153, 2001.
-  I. H. Oh, N. Nomura, N. Masahashi, and S. Hanada, “Mechanical properties of porous titanium compacts prepared by powder sintering,” Scr. Mater., Vol.49, pp. 1197-1202, 2003.
-  N. Nomura, T. Kohama, I. H. Oh, S. Hanada, A. Chiba, M. Kanehira, and K. Sasaki, “Mechanical properties of porous Ti-15Mo-5Zr-3Al compacts prepared by powder sintering,” Mater. Sci. Eng. C, Vol.25, pp. 330-335, 2005.
-  E. Schneider, C. Kinast, J. Eulenberger, D.Wyder, G. Eskilsson, and S.M. Perren, “A comparative study of the initial stability of cementless hip prostheses,” Clin. Orthop. Relat. Res., Vol.248, pp. 200-209, 1989.
-  J. Banhart, “Manufacture, characterisation and application of cellular metals and metal foams,” Prog. Mater. Sci., Vol.46, pp. 559-632, 2001.
-  A. H. Burstein, D. T. Reilly, and M. Martens, “Aging of Bone Tissue: Mechanical Properties,” J. Bone Joint Surg., Vol.58, pp. 82-86, 1976.
-  M. Tane, T. Ichitsubo, H. Nakajima, S. K. Hyun, and M. Hirao, “Elastic properties of lotus-type porous iron: acoustic measurement and extended effective-mean-field theory,” Acta Materialia, Vol.52, pp. 5195-5201, 2004.
-  M. Tane, T. Ichitsubo, S. K. Hyun, and H. Nakajima, “Anisotropic yield behavior of lotus-type porous iron: Measurements and micromechanical mean-field analysis,” J.Mater. Res., Vol.20, pp. 135-143, 2005.
-  S. K. Hyun, T. Ikeda, and H. Nakajima, “Fabrication of lotus-type porous iron and its mechanical properties,” Sci. Tec. Adv. Mat., Vol.5, pp. 201-205, 2004.
-  Y. Higuchi, Y. Ohashi, and H. Nakajima, “Biocompatibility of Lotus-type Stainless Steel and Titanium in Alveolar Bone,” Adv. Eng. Mater., Vol.8, pp. 907-912, 2006.
-  G. N. Levy, R. Schindel, and J. P. Kruth, “Rapid Manufacturing and Rapid Tooling with Layer Manufacturing (LM) Technologies, State of The Art and Future Perspectives,” CIRP Annals, Vol.52, pp. 589-609, 2003.
-  J. P. Kruth, G. Levy, F. Klocke, and T. H. C. Childs, “Consolidation phenomena in laser and powder-bed based layered manufacturing,” CIRP Annals, Vol.56, pp. 730-759, 2007.
-  A. Simchi and H. Asgharzadeh, “Densification and microstructural evaluation during laser sintering of M2 high speed steel powder,” Mater. Sci. Technol., Vol.20, pp. 1462-1468, 2004.
-  A. Simchi and H. Pohl, “Direct laser sintering of iron-graphite powder mixture,” Mater. Sci. Eng. A, Vol.383, pp. 191-200, 2004.
-  R. Morgan, C. J. Sutcliffe, and W. O’Neill, “Density analysis of direct metal laser re-melted 316L stainless steel cubic primitives,” J. Mater. Sci., Vol.39, pp. 1195-1205, 2004.
-  M. Rombouts, J. P. Kruth, L. Froyen, and P. Mercelis, “Fundamentals of Selective Laser Melting of alloyed steel powders,” CIRP Annals, Vol.55, pp. 187-192, 2006.
-  T. Nakamoto, N. Shirakawa, Y.Miyata, and H. Inui, “Selective laser sintering of high carbon steel powders studied as a function of carbon content,” J. Mater. Process. Technol., Vol.209, pp. 5653-5660, 2009.
-  T. Nakamoto, N. Shirakawa, Y. Miyata, and T. Sone, “Plasma nitriding to selective laser sintering parts made of SCM430 powder,” Surf. Coat. Technol., Vol.202, pp. 5484-5487, 2008.
-  T. Nakamoto, N. Shirakawa, Y. Miyata, T. Sone, and H. Inui, “Selective Laser Sintering and Subsequent Gas Nitrocarburizing of Low Carbon Steel Powder,” Int. J. of Automation Technology, Vol.2, pp. 168-174, 2008.
-  F. Abe, E. C. Santos, K. Osakada, and M. Shiomi, “Influence of forming conditions on the titanium model in rapid prototyping with the selective laser melting process,” Proc. Instn. Mech. Engrs. Part C: J. Mechanical Engineering Science, Vol.217, pp. 119-126, 2003.
-  E. C. Santos, K. Osakada, M. Shiomi, Y. Kitamura, and F. Abe, “Microstructure and mechanical properties of pure titanium models fabricated by selective laser melting,” Proc. Instn.Mech. Engrs. Part C: J. Mechanical Engineering Science, Vol.218, pp. 711-719, 2004.
-  A. Fukuda, M. Takemoto, T. Saito, S. Fujibayashi, M. Neo, D. K. Pattanayak, T. Matsushita, K. Sasaki, N. Nishida, T. Kokubo, and T. Nakamura, “Osteoinduction of porous Ti implants with a channel structure fabricated by selective laser melting,” Acta Biomaterialia, Vol.7, pp. 2327-2336, 2011.
-  R. Stamp, P. Fox, W. O’Neill, E. Jones, and C. Sutcliffe, “The development of a scanning strategy for the manufacture of porous biomaterials by selective laser melting,” J. Mater. Sci.: Mater. Med., Vol.20, pp. 1839-1848, 2009.
-  V. Karageorgiou and D. Kaplan, “Porosity of 3D biomaterial scaffolds and osteogenesis,” Biomaterials, Vol.26, pp. 5474-5491, 2005.