Additive Manufactured Polymer-Bonded Isotropic NdFeB Magnets by Stereolithography and Their Comparison to Fused Filament Fabricated and Selective Laser Sintered Magnets
Christian Huber,
Gerald Mitteramskogler,
Michael Goertler,
Iulian Teliban,
Martin Groenefeld,
Dieter Suess
Affiliations
Christian Huber
Physics of Functional Materials, University of Vienna, 1090 Vienna, Austria
Gerald Mitteramskogler
Incus GmbH, 1220 Vienna, Austria
Michael Goertler
Institute for Surface Technologies and Photonics, Joanneum Research Forschungsgesellschaft GmbH, 8712 Niklasdorf, Austria
Iulian Teliban
Magnetfabrik Bonn GmbH, 53119 Bonn, Germany
Martin Groenefeld
Magnetfabrik Bonn GmbH, 53119 Bonn, Germany
Dieter Suess
Physics of Functional Materials, University of Vienna, 1090 Vienna, Austria
Magnetic isotropic NdFeB powder with a spherical morphology is used to 3D print magnets by stereolithography (SLA). Complex magnets with small feature sizes in a superior surface quality can be printed with SLA. The magnetic properties of the 3D printed bonded magnets are investigated and compared with magnets manufactured by fused filament fabrication (FFF), and selective laser sintering (SLS). All methods use the same hard magnetic isotropic NdFeB powder material. FFF and SLA use a polymer matrix material as binder, SLS sinters the powder directly. SLA can print magnets with a remanence of 388 mT and a coercivity of 0.923 T. A complex magnetic design for speed wheel sensing applications is presented and printed with all methods.