TY - JOUR
T1 - Influence of the Infill Orientation on the Properties of Zirconia Parts Produced by Fused Filament Fabrication
AU - Cano Cano, Santiago
AU - Lube, Tanja
AU - Huber, Philipp
AU - Gallego, Alberto
AU - Naranjo, Juan Alfonso
AU - Berges, Cristina
AU - Schuschnigg, Stephan
AU - Herranz, Gemma
AU - Kukla, Christian
AU - Holzer, Clemens
AU - Gonzalez-Gutierrez, Joamin
N1 - Publisher Copyright: © 2020 by the authors.
PY - 2020/7/15
Y1 - 2020/7/15
N2 - The fused filament fabrication (FFF) of ceramics enables the additive manufacturing of components with complex geometries for many applications like tooling or prototyping. Nevertheless, due to the many factors involved in the process, it is difficult to separate the effect of the different parameters on the final properties of the FFF parts, which hinders the expansion of the technology. In this paper, the effect of the fill pattern used during FFF on the defects and the mechanical properties of zirconia components is evaluated. The zirconia-filled filaments were produced from scratch, characterized by different methods and used in the FFF of bending bars with infill orientations of 0°, ±45° and 90° with respect to the longest dimension of the specimens. Three-point bending tests were conducted on the specimens with the side in contact with the build platform under tensile loads. Next, the defects were identified with cuts in different sections. During the shaping by FFF, pores appeared inside the extruded roads due to binder degradation and or moisture evaporation. The changes in the fill pattern resulted in different types of porosity and defects in the first layer, with the latter leading to earlier fracture of the components. Due to these variations, the specimens with the 0° infill orientation had the lowest porosity and the highest bending strength, followed by the specimens with ±45° infill orientation and finally by those with 90ffi infill orientation.
AB - The fused filament fabrication (FFF) of ceramics enables the additive manufacturing of components with complex geometries for many applications like tooling or prototyping. Nevertheless, due to the many factors involved in the process, it is difficult to separate the effect of the different parameters on the final properties of the FFF parts, which hinders the expansion of the technology. In this paper, the effect of the fill pattern used during FFF on the defects and the mechanical properties of zirconia components is evaluated. The zirconia-filled filaments were produced from scratch, characterized by different methods and used in the FFF of bending bars with infill orientations of 0°, ±45° and 90° with respect to the longest dimension of the specimens. Three-point bending tests were conducted on the specimens with the side in contact with the build platform under tensile loads. Next, the defects were identified with cuts in different sections. During the shaping by FFF, pores appeared inside the extruded roads due to binder degradation and or moisture evaporation. The changes in the fill pattern resulted in different types of porosity and defects in the first layer, with the latter leading to earlier fracture of the components. Due to these variations, the specimens with the 0° infill orientation had the lowest porosity and the highest bending strength, followed by the specimens with ±45° infill orientation and finally by those with 90ffi infill orientation.
KW - fused filament fabrication
KW - zirconia
KW - material extrusion
KW - infill orientation
KW - raster orientation
KW - fill pattern
KW - rheology
KW - bending strength
KW - printing defects
UR - https://www.mdpi.com/1996-1944/13/14/3158
UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85088504870&origin=inward&txGid=424a2a8f46e0db730ebbdbea51df60a0
U2 - 10.3390/ma13143158
DO - 10.3390/ma13143158
M3 - Article
SN - 1996-1944
VL - 13.2020
JO - Materials
JF - Materials
IS - 14
M1 - 3158
ER -