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Open AccessArticle

A 3D-Printable Polymer-Metal Soft-Magnetic Functional Composite—Development and Characterization

1
Laboratory for Materials Processing, University of Freiburg, 79110 Freiburg, Germany
2
Karlsruhe Institute of Technology, Institute of Applied Materials, 76344 Karlsruhe, Germany
*
Author to whom correspondence should be addressed.
Materials 2018, 11(2), 189; https://doi.org/10.3390/ma11020189
Received: 29 December 2017 / Revised: 18 January 2018 / Accepted: 22 January 2018 / Published: 25 January 2018
(This article belongs to the Special Issue NextGen Materials for 3D Printing)
In this work, a 3D printed polymer–metal soft-magnetic composite was developed and characterized for its material, structural, and functional properties. The material comprises acrylonitrile butadiene styrene (ABS) as the polymer matrix, with up to 40 vol. % stainless steel micropowder as the filler. The composites were rheologically analyzed and 3D printed into tensile and flexural test specimens using a commercial desktop 3D printer. Mechanical characterization revealed a linearly decreasing trend of the ultimate tensile strength (UTS) and a sharp decrease in Young’s modulus with increasing filler content. Four-point bending analysis showed a decrease of up to 70% in the flexural strength of the composite and up to a two-factor increase in the secant modulus of elasticity. Magnetic hysteresis characterization revealed retentivities of up to 15.6 mT and coercive forces of up to 4.31 kA/m at an applied magnetic field of 485 kA/m. The composite shows promise as a material for the additive manufacturing of passive magnetic sensors and/or actuators. View Full-Text
Keywords: polymer–metal composite; 3D printing; fused deposition modeling; material characterization; mechanical characterization; magnetic characterization polymer–metal composite; 3D printing; fused deposition modeling; material characterization; mechanical characterization; magnetic characterization
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Khatri, B.; Lappe, K.; Noetzel, D.; Pursche, K.; Hanemann, T. A 3D-Printable Polymer-Metal Soft-Magnetic Functional Composite—Development and Characterization. Materials 2018, 11, 189.

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