Graphite foam from pitch and expandable graphite

dc.contributor.authorFocke, Walter Wilhelm
dc.contributor.authorBadenhorst, Heinrich
dc.contributor.authorRamjee, Shatish
dc.contributor.authorKruger, Hermanus Joachim
dc.contributor.authorVan Schalkwyk, Riaan
dc.contributor.authorRand, Brian
dc.contributor.emailwalter.focke@up.ac.zaen_US
dc.date.accessioned2014-05-12T10:52:53Z
dc.date.available2014-05-12T10:52:53Z
dc.date.issued2014-07
dc.description.abstractGraphite 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.librarianhb2014en_US
dc.description.sponsorshipSouth African Research Chairs Initiative of the Department of Science and Technology (DST) and the National Research Foundation (NRF).en_US
dc.description.urihttp://www.elsevier.com/locate/carbonen_US
dc.identifier.citationFocke, 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.issn0008-6223 (print)
dc.identifier.issn1873-3891 (online)
dc.identifier.other10.1016/j.carbon.2014.02.035
dc.identifier.urihttp://hdl.handle.net/2263/39766
dc.language.isoenen_US
dc.publisherElsevieren_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.2014.02.035en_US
dc.subjectGraphite foamen_US
dc.subjectExpandable graphiteen_US
dc.subjectMesophase pitchen_US
dc.titleGraphite foam from pitch and expandable graphiteen_US
dc.typePostprint Articleen_US

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