TY - CONF

T1 - Potential of Extrusion Based 3D-printed Hardmetal and Cermet Parts

AU - Kitzmantel, Michael

AU - Lengauer, Walter

AU - Duretek, Ivica

AU - Schwarz , Viktoria

AU - Kukla, Christian

AU - Lieberwirth, Clemens

AU - Morrison, Vincent

AU - Wilfinger, Thomas

AU - Neubauer, Erich

PY - 2018/9/30

Y1 - 2018/9/30

N2 - Hardmetal and cermet bodies were printed by fused-filament fabrication (FFF) and composite- extrusion modelling (CEM) in an SDS (shaping – debinding – sintering) process. For FFF the filaments were prepared fromhardmetal (WC-10Co) and cermet powder (Ti(C,N)-Co/Ni-based) and organic binder. The CEM feedstock consisted of WC-Co MIM powder. A 3D filament printer as well as a 3D printer working with a granulate such as used in MIM wereemployed to fabricate printed bodies by FFF and CEM, respectively. The solvent debinding process was performed in cyclohexane (FFF-printed bodies) or water (CEM-printed bodies). Thermal debinding of all parts was performed in a tubefurnace up to a temperature of 800℃. The pre-sintered parts were then subjected to vacuum sintering by application of conventional vacuum sintering profiles up to 1430℃ for hardmetals and up to 1460℃ for cermets. Dimensional and masschanges upon the various preparation steps as well as microstructure and porosity of the sintered bodies were investigated. While the microstructure is practically identical to that of conventionally prepared materials, some cavities are present from the printing process because of yet non-optimised printing strategy. The study shows that with the applied 3D printing techniques, hardmetal and cermet parts with innovative geometries are accessible.

AB - Hardmetal and cermet bodies were printed by fused-filament fabrication (FFF) and composite- extrusion modelling (CEM) in an SDS (shaping – debinding – sintering) process. For FFF the filaments were prepared fromhardmetal (WC-10Co) and cermet powder (Ti(C,N)-Co/Ni-based) and organic binder. The CEM feedstock consisted of WC-Co MIM powder. A 3D filament printer as well as a 3D printer working with a granulate such as used in MIM wereemployed to fabricate printed bodies by FFF and CEM, respectively. The solvent debinding process was performed in cyclohexane (FFF-printed bodies) or water (CEM-printed bodies). Thermal debinding of all parts was performed in a tubefurnace up to a temperature of 800℃. The pre-sintered parts were then subjected to vacuum sintering by application of conventional vacuum sintering profiles up to 1430℃ for hardmetals and up to 1460℃ for cermets. Dimensional and masschanges upon the various preparation steps as well as microstructure and porosity of the sintered bodies were investigated. While the microstructure is practically identical to that of conventionally prepared materials, some cavities are present from the printing process because of yet non-optimised printing strategy. The study shows that with the applied 3D printing techniques, hardmetal and cermet parts with innovative geometries are accessible.

M3 - Paper

SP - 938

EP - 945

T2 - World Congress on Powder Metallurgy, WORLDPM2018

Y2 - 16 September 2018 through 20 September 2018

ER -