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Thermally onductive composites for FDM 3D printing
Year: 2023
Type of publication: ostatní - článek ve sborníku
Name of source: 6th International Conference on 3D Printing & Bioprinting, AI, Digital & Additive Manufacturing
Publisher name: NANOTEXNOLOGY
Page from-to: 20-20
Titles:
Language Name Abstract Keywords
eng Thermally onductive composites for FDM 3D printing Presented study is focused on developing thermal conductive filaments for FDM 3D printing. Thermally conductive polymer composites, thanks to their increased thermal conductivity, can be used in many technical applications where the properties of plastics are required, and heat exchange is also necessary. Besides heat sinks, thermally conductive composites can be used for heat exchangers in any engineering environment. The study summarizes available approaches for increasing the thermal conductivity of polymers. The first approach covers the achievement of molecular orientation with semicrystalline polymers using 3D printing. For polymer composites, there is a principle based on a thermally conductive network explained by percolation theory where different shapes and sizes of fillers are used, or incorporation as many fillers as possible. Another approach is to use the method of different surface energy, where the polymer does not wet a filler, and the filler migrates into the voids between the individual printed paths. The last approach is based on a segregated structure using coextrusion with a core with as high volume of thermally conductive filler as possible. The experimental part of the study is based on composite filament fabrication for FDM 3D printing with the thermally conductive network. Thermally conductive filaments were extruded using a polycarbonate matrix and various thermally conductive fillers – hexagonal boron nitride, expanded graphite, pitchbased carbon fibers, and aluminum particles. Thermal conductivity of up to 1.56 W m−1 K−1 was achieved for a mixture of all fillers, which is 5-fold higher than for neat polycarbonate. In the case of polycarbonate with hexagonal boron nitride, the filler migration from the matrix was observed by SEM analysis. Different surface energy method ought to be further improved by choosing the most suitable fillers and the appropriate size of the voids into which the filler would migrate. Thermally onductive composites; FDM; 3D printing

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