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Open Access item Effect of carbon nanofibers content on thermal properties of ceramic nanocomposites

Authors:Borrell, Amparo
Rocha, Victoria G.
Torrecillas, Ramón
Fernández, Adolfo
Issue Date:2011
Publisher:Sage Publications
Citation:Journal of Composite Materials 46(10): 1229-1234 (2011)
Abstract:The thermal properties of carbon nanofibers (CNFs)-alumina and CNFs-zirconia nanocomposites densified by spark plasma sintering technique were evaluated. The influence of CNFs content and type of ceramic matrix on thermal conductivity of ceramic-CNFs materials, measured by the laser-flash method, was studied. The effect of CNFs depends noticeably on the ceramic component and thus, an increase of 83% and a decrease of 97% in thermal conductivity at room temperature is observed when 80 vol% of CNFs is added to ZrO2 and Al2O3, respectively. However, even if the thermal conductivity is lower, the efficiency of heat transfer to the environment in CNFs/Al2O3 nanocomposites is better than that corresponding to monolithic alumina. This behavior is due to CNFs arrangement in dense materials. Considering the low electrical resistivity for CNFs/ Al2O3 and CNFs/ ZrO2 materials (10-1¿10-2 ¿·cm), these nanocomposites are promising candidates as thermoelectric materials that require low thermal conductivity, but high electrical conductivity.
Publisher version (URL):http://dx.doi.org/10.1177/0021998311416528
Identifiers:doi: 10.1177/0021998311416528
issn: 0021-9983
Appears in Collections:(CINN) Artículos

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