Abstract
Directional freeze-casting - a process used in order to produce foams with elongated, aligned pores applied so far exclusively for ceramics - is demonstrated for a titanium foam. An aqueous slurry of <45 μm titanium powders is directionally solidified, resulting in a preform with elongated, aligned, dendrites of 0.2 wt% agar solution, separated by interdendritic regions with high powdercontent. The preform is freeze-dried to remove the ice dendrites and sintered. The resulting titanium foams show 60 vol% aligned pores (̃0.1 mm width and several millimeters long) replicating theice dendrites and separated by walls constructed by partially-sintered titanium powders. On the other hand, when large size powder (<125 μm) was applied, their larger size inhibits the formationof pure ice dendrites, in agreement with a theoretical model.
Original language | English (US) |
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Title of host publication | MetFoam 2007 - Proceedings of the 5th International Conference on Porous Metals and Metallic Foams |
Pages | 263-266 |
Number of pages | 4 |
State | Published - Nov 27 2008 |
Event | 5th International Conference on Porous Metals and Metallic Foams, MetFoam 2007 - Montreal, QC, Canada Duration: Sep 5 2008 → Sep 7 2008 |
Other
Other | 5th International Conference on Porous Metals and Metallic Foams, MetFoam 2007 |
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Country/Territory | Canada |
City | Montreal, QC |
Period | 9/5/08 → 9/7/08 |
ASJC Scopus subject areas
- Metals and Alloys