Talks and Poster Presentations (with Proceedings-Entry):
S. Baumgartner, M. Pfaffinger, J. Stampfl:
"Lithography based additive manufacturing of structural and functional ceramics";
Talk: 6th International Congress on Ceramics,
- 08-25-2016; in: "From Lab to Fab - Abstracts Lectures&Posters",
Additive Manufacturing (AM) of high performance materials provides
various advantages over conventional manufacturing methods like
milling or casting. On the one hand, the layer-by-layer approach allows
the construction of complex structures with nearly unlimited freedom
of design. On the other hand, the labour-intensive tool production
omits, while waste material is significantly reduced. This is especially
interesting for the processing of advanced ceramic materials.
Regarding ceramics, stereolithography (SLA) provides the highest
surface quality and achievable precision compared to other AM
technologies, such as 3D or Inkjet Printing, Fused Deposition Modeling,
or Selective Laser Sintering. A high surface quality is crucial for
obtaining good mechanical properties in ceramic materials, which are,
due to their low fracture toughness, sensitive to surface flaws.
At the TU Wien different kinds of ceramics and glass-ceramics, like
zirconia (ZrO2), alumina (Al2O3), tricalcium phosphate (TCP) and
bioactive glasses, can be processed using SLA. Based on the principle
of Digital Light Processing (DLP) a mask of visible blue light for the
selective curing of highly filled photopolymers is generated. After the
3D printing process the so called green part undergoes a thermal
treatment where debinding and sintering takes place in order to get
dense ceramic parts.
Continuously improving the process by modification of the slurry´s
composition, the building and thermal processing parameters is
amongst others rewarded by promising results regarding the biaxial
bending strength of AM ceramic parts for the achieved values are in
the range given in literature or even higher like 1100 MPa for ZrO2 or
32 MPa for TCP.
Created from the Publication Database of the Vienna University of Technology.