Dynamic freeze casting for the production of porous titanium (Ti) scaffolds |
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Authors: | Hyun-Do Jung Se-Won Yook Tae-Sik Jang Yuanlong Li Hyoun-Ee Kim Young-Hag Koh |
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Affiliation: | 1. WCU Hybrid Materials Program, Department of Materials Science and Engineering, Seoul National University, Seoul 151‐742, Republic of Korea;2. Department of Dental Laboratory Science and Engineering, Korea University, Seoul 136‐703, Republic of Korea |
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Abstract: | This paper proposes dynamic freeze casting as a new manufacturing technique for producing porous Ti scaffolds with a uniform porous structure and good ductility. In this method, Ti/camphene slurries with various initial Ti contents (15, 20, and 25 vol.%) were frozen at 44 °C for 12 h in rotation, which allowed for the extensive growth of camphene crystals and the uniform construction of walls made of Ti particles. All the fabricated samples showed spherical-like pores surrounded by dense Ti walls that were uniformly formed after sintering at 1300 °C for 2 h in a vacuum. The porosity decreased from 71 to 52 vol.% with an increase in Ti content from 15 to 25 vol.%, whereas the pore size decreased from 362 to 95 μm. On the other hand, the compressive strength and stiffness increased considerably from 57 ± 4 to 183 ± 6 MPa and from 1.3 ± 0.5 to 5.0 ± 0.8 GPa, respectively, due to the decrease in the porosity of the samples. |
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