Improvement of the layer-layer adhesion in FFF 3D printed PEEK/carbon fibre composites

Krzysztof Rodzen, Eileen Harkin-Jones, Marcin Wegrzyn, Pratikshya Sharma, Alexander Zhigunov

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Improvement of the mechanical properties of FFF 3D printed CF/PEEK composites was achieved by printing under favorable crystallization conditions. It was possible to improve the layer-layer tensile strength more than fivefold from 6.96 MPa to 36.28 MPa by printing in a specially customised, low cost printer operated with a heated print chamber at 230℃. The influence of the chamber temperature on the mechanical and crystalline structure was investigated to determine the best conditions. A maximum flexural modulus of 14 946 MPa and flexural stress at break of 248.9 MPa were achieved. A proof of concept study involved the 3DP of a CF/PEEK mould tooling insert for injection moulding. This insert replaced a costly traditional metal insert to print short production runs of ABS and HIPS polymers. This work offers a low cost and rapid means to produce effective tooling inserts for the injection moulding industry.
Original languageEnglish
Article number106532
Number of pages11
JournalComposites Part A: Applied Science and Manufacturing
Early online date27 Jun 2021
Publication statusPublished (in print/issue) - 1 Oct 2021


  • 3-D Printing
  • Carbon fibres
  • High-temperature properties
  • Polymer-matrix composites (PMCs)


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