Abstract
Nowadays, the development of materials with gradient porosity is an important aim for many applications, especially in the field of bone tissue replacement. This research work shows the design and manufacture of a simple and economical device to process Ti cylinders with elongated and high interconnected porosity by freeze-casting techniques. The influence of the vessel material on the internal lamellar structure of the porous Ti samples is also studied. The device has been validated with: (i) a thermal gradient from -10 °C at the cold surface to 20 °C at the hot surface; and (ii) a cylindrical vessel with 12 mm diameter of alumina or Teflon. These working conditions have allowed maintaining the freezing conditions during the full process (alumina vessel: 30 minutes; Teflon vessel: 3 hours). After the solidification of the Ti aqueous suspension, the ice is sublimated (24 hours at -50 °C and 0.070 mbar). Then, the resulting powder is sintered (1150 °C for 5 h at high vacuum ~ 10 -5 mbar), obtaining the porous Ti sample with the final structural strength. Finally, a detailed study of the most relevant porosity features is performed: porosity ratio and interconnectivity degree by Archimedes' method, and size and shape of the pores by image analysis at three different zones along the longitudinal cross section. The results indicate the viability of the device to enhance the directional freezing and thus, the elongated porosity. Teflon vessel present the best results, with an average porosity ratio and porosity size of 39.5 % and 123.3 µm, respectively. This suggests an optimal biomechanical and bifunctional balance of this porous material.
| Original language | English (US) |
|---|---|
| Title of host publication | Titanium Powder Metallurgy and Additive Manufacturing |
| Editors | Ma Qian, Peng Cao, Huiping Tang, Gang Chen, Yong Liu |
| Publisher | Trans Tech Publications Ltd |
| Pages | 255-261 |
| Number of pages | 7 |
| ISBN (Print) | 9783035711639 |
| DOIs | |
| State | Published - Jan 1 2018 |
| Event | 4th International Conference on Powder Metallurgy of Titanium, PMTi 2017 - Xian, China Duration: Sep 8 2017 → Sep 10 2017 |
Publication series
| Name | Key Engineering Materials |
|---|---|
| Volume | 770 KEM |
| ISSN (Print) | 1013-9826 |
Other
| Other | 4th International Conference on Powder Metallurgy of Titanium, PMTi 2017 |
|---|---|
| Country | China |
| City | Xian |
| Period | 9/8/17 → 9/10/17 |
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Keywords
- Freeze-casting technique
- Gradient porosity
- Porous titanium
ASJC Scopus subject areas
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering
Cite this
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A simple and economical device to process Ti cylinders with elongated porosity by freeze-casting techniques : Design and manufacturing. / Muñoz, Paloma Trueba; Bascón Suárez, Joaquín R.; Beltrán, Ana M.; Rodriguez-Ortiz, José Antonio; Hernández, Yadir Torres; Palacio, Juan José Pavón; Álvarez, Esteban Alonso; Dunand, David C.
Titanium Powder Metallurgy and Additive Manufacturing. ed. / Ma Qian; Peng Cao; Huiping Tang; Gang Chen; Yong Liu. Trans Tech Publications Ltd, 2018. p. 255-261 (Key Engineering Materials; Vol. 770 KEM).Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
TY - GEN
T1 - A simple and economical device to process Ti cylinders with elongated porosity by freeze-casting techniques
T2 - Design and manufacturing
AU - Muñoz, Paloma Trueba
AU - Bascón Suárez, Joaquín R.
AU - Beltrán, Ana M.
AU - Rodriguez-Ortiz, José Antonio
AU - Hernández, Yadir Torres
AU - Palacio, Juan José Pavón
AU - Álvarez, Esteban Alonso
AU - Dunand, David C
PY - 2018/1/1
Y1 - 2018/1/1
N2 - Nowadays, the development of materials with gradient porosity is an important aim for many applications, especially in the field of bone tissue replacement. This research work shows the design and manufacture of a simple and economical device to process Ti cylinders with elongated and high interconnected porosity by freeze-casting techniques. The influence of the vessel material on the internal lamellar structure of the porous Ti samples is also studied. The device has been validated with: (i) a thermal gradient from -10 °C at the cold surface to 20 °C at the hot surface; and (ii) a cylindrical vessel with 12 mm diameter of alumina or Teflon. These working conditions have allowed maintaining the freezing conditions during the full process (alumina vessel: 30 minutes; Teflon vessel: 3 hours). After the solidification of the Ti aqueous suspension, the ice is sublimated (24 hours at -50 °C and 0.070 mbar). Then, the resulting powder is sintered (1150 °C for 5 h at high vacuum ~ 10 -5 mbar), obtaining the porous Ti sample with the final structural strength. Finally, a detailed study of the most relevant porosity features is performed: porosity ratio and interconnectivity degree by Archimedes' method, and size and shape of the pores by image analysis at three different zones along the longitudinal cross section. The results indicate the viability of the device to enhance the directional freezing and thus, the elongated porosity. Teflon vessel present the best results, with an average porosity ratio and porosity size of 39.5 % and 123.3 µm, respectively. This suggests an optimal biomechanical and bifunctional balance of this porous material.
AB - Nowadays, the development of materials with gradient porosity is an important aim for many applications, especially in the field of bone tissue replacement. This research work shows the design and manufacture of a simple and economical device to process Ti cylinders with elongated and high interconnected porosity by freeze-casting techniques. The influence of the vessel material on the internal lamellar structure of the porous Ti samples is also studied. The device has been validated with: (i) a thermal gradient from -10 °C at the cold surface to 20 °C at the hot surface; and (ii) a cylindrical vessel with 12 mm diameter of alumina or Teflon. These working conditions have allowed maintaining the freezing conditions during the full process (alumina vessel: 30 minutes; Teflon vessel: 3 hours). After the solidification of the Ti aqueous suspension, the ice is sublimated (24 hours at -50 °C and 0.070 mbar). Then, the resulting powder is sintered (1150 °C for 5 h at high vacuum ~ 10 -5 mbar), obtaining the porous Ti sample with the final structural strength. Finally, a detailed study of the most relevant porosity features is performed: porosity ratio and interconnectivity degree by Archimedes' method, and size and shape of the pores by image analysis at three different zones along the longitudinal cross section. The results indicate the viability of the device to enhance the directional freezing and thus, the elongated porosity. Teflon vessel present the best results, with an average porosity ratio and porosity size of 39.5 % and 123.3 µm, respectively. This suggests an optimal biomechanical and bifunctional balance of this porous material.
KW - Freeze-casting technique
KW - Gradient porosity
KW - Porous titanium
UR - http://www.scopus.com/inward/record.url?scp=85047851674&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85047851674&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/KEM.770.255
DO - 10.4028/www.scientific.net/KEM.770.255
M3 - Conference contribution
SN - 9783035711639
T3 - Key Engineering Materials
SP - 255
EP - 261
BT - Titanium Powder Metallurgy and Additive Manufacturing
A2 - Qian, Ma
A2 - Cao, Peng
A2 - Tang, Huiping
A2 - Chen, Gang
A2 - Liu, Yong
PB - Trans Tech Publications Ltd
ER -