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  • Effect of carbon nanofibers content on thermal properties of ceramic nanocomposites. Borrell, A., Rocha, V.G., Torrecillas, R., Fernández, A.(2012)

Effect of carbon nanofibers content on thermal properties of ceramic nanocomposites. Borrell, A., Rocha, V.G., Torrecillas, R., Fernández, A.(2012)

Journal of Composite Materials, 46 (10), pp. 1229-1234. 

http://jcm.sagepub.com/content/46/10/1229.abstract

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 Ω·cm), these nanocomposites are promising candidates as thermoelectric materials that require low thermal conductivity, but high electrical conductivity.

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