Authors:
Sebastian Riecker (Fraunhofer Institute for Manufacturing Technology and Advanced Materials IFAM, Branch Lab Dresden, Germany),
Robert Teuber (Fraunhofer Institute for Manufacturing Technology and Advanced Materials IFAM, Branch Lab Dresden, Germany),
Anne Mannschatz (Fraunhofer Institute for Ceramic Technologies and Systems IKTS, Germany),
Bernhard Müller (Fraunhofer Institute for Machine Tools and Forming Technology, Germany)
Abstract:
Pseudoelastic behavior with elastic strains of up to 8 % and the shape memory effect are well-known features of nickel-titanium alloys (Nitinol). These properties are highly interesting for the fabrication of e.g. functional auxetic and programmable structures as well as for solid state joints and compliant mechanisms. To extend the current range of available geometries and to enable near-term fabrication of customized complex devices, sinter-based additive manufacturing (AM) of NiTi components via Fused Filament Fabrication (FFF) has been investigated. For this purpose, a highly filled thermoplastic filament (63 vol.-% powder) has been developed which could be printed to complex geometries using standard FFF printers. The AM post-processing steps of debinding and sintering were aiming for extraction of O, C and N to achieve the desired properties. Green state machining experiments resulted in high part quality and low surface roughness of Ra <5 µm.
DOI:
https://doi.org/10.59499/WP225371432