Robocasting of alumina hollow filament lattice structures

Journal article


Publication Details

Author(s): Schlordt T, Schwanke S, Keppner F, Fey T, Travitzky N, Greil P
Journal: Journal of the European Ceramic Society
Publisher: Elsevier
Publication year: 2013
Volume: 33
Pages range: 3243-3248
ISSN: 0955-2219


Abstract


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.



FAU Authors / FAU Editors

Fey, Tobias Dr.
Lehrstuhl für Werkstoffwissenschaften (Glas und Keramik)
Greil, Peter Prof. Dr.
Lehrstuhl für Werkstoffwissenschaften (Glas und Keramik)
Keppner, Felix
Lehrstuhl für Werkstoffwissenschaften (Glas und Keramik)
Schlordt, Tobias
Lehrstuhl für Werkstoffwissenschaften (Glas und Keramik)
Travitzky, Nahum Prof. Dr.
Lehrstuhl für Werkstoffwissenschaften (Glas und Keramik)


How to cite

APA:
Schlordt, T., Schwanke, S., Keppner, F., Fey, T., Travitzky, N., & Greil, P. (2013). Robocasting of alumina hollow filament lattice structures. Journal of the European Ceramic Society, 33, 3243-3248. https://dx.doi.org/10.1016/j.jeurceramsoc.2013.06.001

MLA:
Schlordt, Tobias, et al. "Robocasting of alumina hollow filament lattice structures." Journal of the European Ceramic Society 33 (2013): 3243-3248.

BibTeX: 

Last updated on 2018-19-04 at 03:06