The Investigation of Laser Sintering Process Using Ti Powder Sheets Toward the Fabrication of Porous Artificial Bones

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  • 有気孔人工骨作製に向けたチタン粉末シートのレーザ焼結プロセスの検討
  • ユウキコウ ジンコウコツ サクセイ ニ ムケタチタン フンマツ シート ノ レーザ ショウケツ プロセス ノ ケントウ

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Abstract

The present paper investigates a process of laser sintering of titanium sheets toward the fabrication of porous artificial bones. The novelty lies in the use of a titanium powder sheet mixed with an organic binder and the application of selective laser sintering to the fabrication of a laminated porous structure. An alternate Nd: YAG laser irradiation with high and low average powers (15W and 1.5W, respectively) results in the suppression of distortion of the sintered part as well as increases in mechanical properties. The titanium specimen with 3×30×3 (height) mm3 has a porosity of 67% and a maximum shape error of less than 10%. A bending strength of 121.5 MPa and a Young's modulus of 11.3 GPa are attainable in the direction perpendicular to the lamination, whereas those in the laminating direction are 35.9 MPa and 1.9 GPa, respectively. It is crucial to improve bonding strength between the sintered sheets toward around 100 MPa for human bones.

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