• 文献标题:   Thermal conductivity of silicon carbide composites with highly oriented graphene nanoplatelets
  • 文献类型:   Article
  • 作  者:   ROMANMANSO B, CHEVILLOTTE Y, OSENDI MI, BELMONTE M, MIRANZO P
  • 作者关键词:   graphene nanoplatelet, silicon carbide, composite, spark plasma sintering, thermal conductivity
  • 出版物名称:   JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
  • ISSN:   0955-2219 EI 1873-619X
  • 通讯作者地址:   CSIC
  • 被引频次:   24
  • DOI:   10.1016/j.jeurceramsoc.2016.06.016
  • 出版年:   2016

▎ 摘  要

Dense silicon carbide (SiC)-based composites containing up to 20 vol.% of graphene nanoplatelets (GNPs) were manufactured via a liquid-phase Spark Plasma Sintering (SPS) process, employing Y2O3 and Al2O3 as sintering aids. The applied uniaxial pressure during SPS produced a preferential orientation of the GNPs, with the ab-plane perpendicular to the pressing axis, thus bringing about high thermal anisotropy. Thermal diffusivity/conductivity were measured as a function of the GNPs content, being enhanced by similar to 30% in the perpendicular direction to the SPS pressing axis, whereas a moderate decrease was observed in the parallel direction owing to the much lower intrinsic conductivity of the aligned GNPs in the c-axis, with no significant contribution of the thermal resistance of the GNP-SiC interfaces. A non-monotonical temperature dependence for the thermal conductivity was detected in composites containing <10 vol.% GNPs, explained by the strong p-doping of these SiC ceramics. (C) 2016 Elsevier Ltd. All rights reserved.