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Title: The role of precursor modification on the production of graphite foam

Abstract

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.

Authors:
ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1543241
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Carbon
Additional Journal Information:
Journal Volume: 144; Journal Issue: C; Journal ID: ISSN 0008-6223
Publisher:
Elsevier
Country of Publication:
United States
Language:
English

Citation Formats

Klett, James W. The role of precursor modification on the production of graphite foam. United States: N. p., 2018. Web. doi:10.1016/j.carbon.2018.11.046.
Klett, James W. The role of precursor modification on the production of graphite foam. United States. doi:10.1016/j.carbon.2018.11.046.
Klett, James W. Wed . "The role of precursor modification on the production of graphite foam". United States. doi:10.1016/j.carbon.2018.11.046.
@article{osti_1543241,
title = {The role of precursor modification on the production of graphite foam},
author = {Klett, James W.},
abstractNote = {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.},
doi = {10.1016/j.carbon.2018.11.046},
journal = {Carbon},
number = C,
volume = 144,
place = {United States},
year = {2018},
month = {11}
}

Journal Article:
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This content will become publicly available on November 21, 2019
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