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Title: Process-Induced Fiber Orientation in Fused Filament Fabrication

As the applications for additive manufacturing have continued to grow, so too has the range of available materials, with more functional or better performing materials constantly under development. This work characterizes a copper-filled polyamide 6 (PA6) thermoplastic composite designed to enhance the thermal conductivity of fused filament fabrication (FFF) parts, especially for heat transfer applications. The composite was mixed and extruded into filament using twin screw extrusion. Because the fiber orientation within the material governs the thermal conductivity of the material, the orientation was measured in the filament, through the nozzle, and in printed parts using micro-computed tomography. The thermal conductivity of the material was measured and achieved 4.95, 2.38, and 0.75 W/(m·K) at 70 °C in the inflow, crossflow, and thickness directions, respectively. The implications of this anisotropy are discussed using the example of an air-to-water crossflow heat exchanger. In conclusion, the lower conductivity in the crossflow direction reduces thermal performance due to the orientation in thin-walled parts.
Authors:
ORCiD logo [1] ;  [1] ;  [1] ;  [1] ;  [2]
  1. Univ. of Wisconsin-Madison, Madison, WI (United States)
  2. AREVO, Inc., Santa Clara, CA (United States)
Publication Date:
Grant/Contract Number:
AR0000573
Type:
Published Article
Journal Name:
Journal of Composites Science
Additional Journal Information:
Journal Volume: 2; Journal Issue: 3; Journal ID: ISSN 2504-477X
Publisher:
MDPI
Research Org:
Univ. of Wisconsin-Madison, Madison, WI (United States)
Sponsoring Org:
USDOE Advanced Research Projects Agency - Energy (ARPA-E)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; thermal conductivity; fiber orientation; composite; filler; heat exchanger; copper
OSTI Identifier:
1462765
Alternate Identifier(s):
OSTI ID: 1462961