SKM 2021 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 4: Poster

DS 4.14: Poster

Dienstag, 28. September 2021, 10:00–13:00, P

Influence of processing parameters on the electrical conductivity of 3D printed silver structures — •Michael Feige, Lennart Schwan, and Sonja Schöning — Bielefeld Institute for Applied Materials Research (BIfAM), Bielefeld University of Applied Sciences, Department of Engineering Sciences and Mathematics

3D-printing of conductive and dielectric materials in one process is an emerging technology. The Multi Material Jetting technique allows to realize three dimensional structures such as antennas, coils or cooling elements.

The deployed method is very similar to that used by a conventional inkjet printer. Small ink drops are deposited layer by layer through fine nozzles in the print heads. The stacking of those layers finally forms the 3D buildup. Multiple materials are introduced by two or more print heads.

In the considered case the dielectric material, a polymer, is cured with UV-light. The conductive material consists of small silver particles and is sintered with IR-light.

The electrical conductivity can reach up to 70 % of the conductivity of copper but it is anisotropic with regard to the print direction and it depends on several production parameters. We are identifying these contributing key factors, like layer thicknesses, drop placement patterns, environmental conditions during the print stage and temperature patterns used for heat treatment during postprocessing. In addition we investigate how the determined influence of the parameters can be used to optimize the conductivity.