Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 33, Issue 15-16, Pages 3243-3248Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2013.06.001
Keywords
Robocasting; Colloidal gel; Rapid prototyping; Filament based writing; Hollow filaments
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Funding
- Deutsche Forschungsgemeinschaft (DFG-Koselleck) [GR 961/32, TR 250/6-1]
- Exzellenzcluster Engineering of Advanced Materials
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Robotic controlled deposition (robocasting) of an aqueous colloidal alpha-Al2O3 gel for manufacturing of cellular ceramics with periodical lattice structure was investigated. The colloidal gel was loaded with 50 vol% alpha-Al2O3 and exhibits shear-thinning behavior, a shear modulus of 288 kPa and a yield-stress of similar to 700 Pa. Tubular filaments of circular and rectangular cross section having an outer diameter of 1.5 mm and a capillary diameter of 0.75 mm were deposited in an oil bath to fabricate lattice truss structures with free spanning filaments. After freeze drying the robocast grids were sintered in air at 1550 degrees C. X-ray mu-CT revealed continuity of the tubular filaments for long distances (similar to 650 mm). Critical conditions to avoid capillary collapse were discussed by considering bulging stress and pressure distribution within the hollow filament. At short filament length oil infiltration into the capillary driven by capillary suction supports the tubular filament whereas oil flow driven by movement of the tool nozzle causes pressure difference to increase linearly with increasing filament length. (C) 2013 Elsevier Ltd. All rights reserved.
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