Measurement of effective thermal conductivity of composite powders of 2D materials and metals for additive manufacturing

Hyunjong Lee*, Apostolos Koutsioukis, Davoud Jafari, Bernard J. Geurts, Wessel W. Wits

*Corresponding author for this work

Research output: Contribution to journalConference articleAcademicpeer-review

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Abstract

Laser Powder Bed Fusion (LPBF), a promising additive manufacturing technique for composites of 2D materials and metals, requires knowledge of thermophysical properties, such as the thermal conductivity of powder, for process optimization. In this study, we measured the effective thermal conductivity of the most representative Cu-graphene composite powder in the field of heat transfer applications. To measure thermal conductivity, we propose a differential scanning calorimetry (DSC) method to measure the thermal resistances of a powder bed under steady-state heat flow conditions. We observe that the thermal conductivity of a composite powder is 1,000 times lower than that of the bulk metal without 2D material addition; e.g., exhibiting ∼ 0.30 W/mK in Cu-1wt.% graphene powder. Furthermore, we discuss powder size and morphology impact on thermal conductivity influencing the number of contact points and thermal contact resistance. Our findings contribute to understanding the thermal conductivity of composite powders in a powder bed and aid in optimizing LPBF processes.

Original languageEnglish
Article number012186
Number of pages6
JournalJournal of physics: Conference series
Volume2766
DOIs
Publication statusPublished - 2024
Event9th European Thermal Sciences Conference, EUROTHERM 2024 - Bled, Slovenia
Duration: 10 Jun 202413 Jun 2024
Conference number: 9

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