dc.contributor.author |
Focke, Walter Wilhelm
|
|
dc.contributor.author |
Badenhorst, Heinrich
|
|
dc.contributor.author |
Ramjee, Shatish
|
|
dc.contributor.author |
Kruger, Hermanus Joachim
|
|
dc.contributor.author |
Van Schalkwyk, Riaan
|
|
dc.contributor.author |
Rand, Brian
|
|
dc.date.accessioned |
2014-05-12T10:52:53Z |
|
dc.date.available |
2014-05-12T10:52:53Z |
|
dc.date.issued |
2014-07 |
|
dc.description.abstract |
Graphite foams were prepared from a coal tar pitch that was partially converted into mesophase.
Expandable graphite was used instead of an inert gas to ‘‘foam’’ the pitch. The resulting
foam was subjected to a series of heat treatments with the objective of first crosslinking
the pitch, and thereafter carbonizing and graphitizing the resulting foam. XRD confirmed
that the graphitization at 2600 C resulted in a highly graphitic material. The porosity of this
foam derives from the loose packing of the vermicular exfoliated graphite particles together
with their internal porosity. During the foaming process the pitch tends to coat the outside
surface of the expanding graphite flakes. It also bonds them together. The graphite foam prepared
with 5 wt.% expandable graphite had a bulk density of 0.249 g cm 3, a compressive
strength of 0.46 MPa and a thermal conductivity of 21Wm 1 K 1. The specific thermal
conductivity (thermal conductivity divided by the bulk density) of this low-density carbon
foam was 0.084Wm2 kg 1 K 1 which is considerably higher than that of copper metal
(0.045Wm2 kg 1 K 1) traditionally used in thermal management applications. |
en_US |
dc.description.librarian |
hb2014 |
en_US |
dc.description.sponsorship |
South African Research Chairs Initiative of the Department of Science and Technology (DST) and the National Research Foundation (NRF). |
en_US |
dc.description.uri |
http://www.elsevier.com/locate/carbon |
en_US |
dc.identifier.citation |
Focke, WW, Badenhorst, H, Ramjee, S, Kruger, HJ, Van Schalkwyk, R & Rand, B 2014, 'Graphite foam from pitch and expandable graphite', Carbon, vol. 73, pp. 41-50. |
en_US |
dc.identifier.issn |
0008-6223 (print) |
|
dc.identifier.issn |
1873-3891 (online) |
|
dc.identifier.other |
10.1016/j.carbon.2014.02.035 |
|
dc.identifier.uri |
http://hdl.handle.net/2263/39766 |
|
dc.language.iso |
en |
en_US |
dc.publisher |
Elsevier |
en_US |
dc.rights |
© 2014 Elsevier Ltd. All rights reserved. Notice : this is the author’s version of a work that was accepted for publication in Carbon. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Carbon, vol. 73, pp. 41-50, 2014. doi : 10.1016/j.carbon.2014.02.035 |
en_US |
dc.subject |
Graphite foam |
en_US |
dc.subject |
Expandable graphite |
en_US |
dc.subject |
Mesophase pitch |
en_US |
dc.title |
Graphite foam from pitch and expandable graphite |
en_US |
dc.type |
Postprint Article |
en_US |