Theoretical and numerical characterization of the thermal conductivity of carbon ceramic material from realistic microscale imaging

Abstract

Abstract. The paper is concerned with the theoretical and numerical characterization of the thermal conductivity of porous carbon ceramic materials. The material structure models are created based on 3D computer tomography (CT) images. The temperature functions of the molecular and effective thermal conductivity for the porous carbon-ceramic material were obtained. It was investigated, whether a simplified model could be used to estimate the thermal conductivity. The thermal conductivity data obtained with the computer tomography method and with the proposed simplified model are compared.

Improvement of Thermal Conductivity for Carbon Fabric Composites Base on the Fabric Structure

“…The matrix phase was also excluded from the calculation model. The influence of the matrix on the results of comparing the thermal conductivity of fabrics of various weaves was considered negligible, since the thermal conductivity of resin epoxy is lower than the thermal conductivity of carbon fibers, so the main heat flow in carbon fiber goes through the fibers [5]. The next step in modeling of heat transfer in a representative volume element is to create a finite element mesh.…”

Development verification of coatings made from porous ceramic-matrix composite materials

“…Ceramic matrix composites (CMC) reinforced with carbon fiber, despite their high oxidation-resistance and erosion-resistance and good mechanical characteristics, possess high density and thermal conductivity, which reduces their attraction as heat-shield materials. The most perspective direction in heat shield development is associated with porous CCM [2,3] that combine the effective density in the range 1200 -1800 kg/m 3 and a substantially lower thermal conductivity coefficient [4,5]. However, to date there is no experimental evidence that porous CCM can withstand the high-enthalpy air flux.…”