On the thermally conductive behaviour of compacted graphite nanosheets

Author

Wen-Shyong Kuo ; Tse-Hao Ko ; Hsin-Fang Lu

Author_Institution

Dept. of Aerosp. & Syst. Eng., Feng-Chia Univ., Taichung, China

Volume

5

Issue

4

fYear

2010

fDate

8/1/2010 12:00:00 AM

Firstpage

219

Lastpage

221

Abstract

Thermally conductive properties of compacts composed of graphite nanosheets (GNSs) are studied. The GNSs were made by the intercalation and exfoliation of natural graphite (NG) flakes. The GNSs were then compressed to make graphite compacts. Thermal diffusivities along the in-plane and transverse directions are measured using a laser flash method. The anisotropic ratio of the thermal conductivities ranges between 20 and 25. The properties of graphite compacts based on NG flakes are also studied. The results reveal that the GNS-based compact can be consolidated at a lower density, whereas the NG-based counterpart is denser and has a higher thermal conductivity. To protect the graphite compact, a method for coating a copper layer on the graphite compact was developed. The results also indicate the copper coating enhances heat transfer into the graphite compact.

Keywords

compaction; copper; density; graphite; laser materials processing; nanostructured materials; thermal conductivity; thermal diffusion; C; anisotropic ratio; compacted graphite nanosheets; copper layer coating; density; graphite compacts; heat transfer; laser flash method; natural graphite flake exfoliation; natural graphite flake intercalation; thermal diffusivities; thermally conductive properties;

fLanguage

English

Journal_Title

Micro & Nano Letters, IET

Publisher

iet

ISSN

1750-0443

Type

jour

DOI

10.1049/mnl.2010.0053

Filename

5562509