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Thermal conductivity of 3D printed PDMS and carbon fiber composite
Ho-Sung Kim, Hoang Minh Khoa Nguyen, Seong Ung Kwak, Jeong Woo Park and Dong-Wook Oh
The bidirectional 3ω method was used to measure the thermal conductivity of a mixture of polydimethylsiloxane (PDMS) and carbon fiber. A PDMS and carbon fiber mixture was printed using fused filament fabrication (FFF) with and without an orifice channel in the extrusion nozzle. Through-plane alignment of carbon fibers inside the PDMS medium can be promoted by embedding an orifice channel in the nozzle during FFF. Thermal conductivity measurement of samples with carbon fiber content varying from 0 to 20 wt. % was performed. Compared with a pristine PDMS, the composite’s thermal conductivity increased up to 50%. Additionally, through- and in-plane thermal conductivities were analyzed through the calculation of the anisotropy ratio. The sample fabricated with the orifice channel embedded nozzle showed up to a 12% higher anisotropy ratio compared to the non-orifice nozzle fabricated sample. In the FFF process, an orifice-embedded nozzle is found to enhance through-plane thermal conductivity by promoting the perpendicular alignment of carbon fibers.
Keywords: 3ω method, PDMS composites, additive alignment, anisotropy ratio
Full Text (IP)
DOI: 10.32908/hthp.v51.1297