The role of precursor modification on the production of graphite foam

Journal Article · 20 November 2018 · Carbon

DOI: https://doi.org/10.1016/j.carbon.2018.11.046 · OSTI ID:1543241

Klett, James W.  ^[1]

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1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

A high-conductivity graphite foam developed at Oak Ridge National Laboratory (ORNL) owes its unique thermal properties to the highly aligned graphitic structure along the cell walls. The material exhibits a peak in thermal conductivity at temperatures like that of highly ordered natural graphite, indicating the foam has an extremely graphitic nature. This paper explores the manufacturing process to identify processing conditions that most affect the properties of the foam, such that the production of the foam can be easily tailored to different applications. This paper examines processing conditions from the precursor preparation as well as additives to the precursor, such as graphene, on the resulting foam structure and thermal properties. It was found that heat treating the precursor mesophase to increase melt viscosity and decrease off gassing during foaming decreased the thermal conductivity of the final foams, however, it resulted in smaller pores. Additions of graphene platelets decreases the thermal conductivity of the foams while simultaneously decreasing the pore size as well. In conclusion, these tradeoffs are evident and present the manufacturer options to tailor the foams.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE
• Grant/Contract Number: AC05-00OR22725
• OSTI ID: 1543241
• Journal Information: Carbon, Journal Name: Carbon Journal Issue: C Vol. 144; ISSN 0008-6223
• Publisher: ElsevierCopyright Statement
• Country of Publication: United States
• Language: English