Prediction of Thermophysical and Thermomechanical Characteristics of Porous Carbon–Ceramic Composite Materials of the Heat Shield of Aerospace Craft

Abstract

A procedure for predicting thermophysical and thermomechanical characteristics of porous carbon-ceramic composite materials of the heat shield of aerospace craft as functions of the type of reinforcement, porosity of the structure, and the characteristics of the material′s components has been developed. Results of mathematical modeling of the temperature and stressed-strained states of representative volume elements for determining the characteristics of a carbon-ceramic composite material with account taken of its anisotropy have been given.

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

“…7) resulted in estimating the value of the total heat flux through the porous material and calculating its effective heat transfer coefficient. The resulting temperature function of the molecular and effective heat transfer coefficient of the porous CCCM is presented in Fig.8 (graphs 1 and 2) and corresponds qualitatively to the data in [4]. …”

“…Despite this CCCM cannot be employed as the mass efficient thermal protection due to their high density (up to 2000 kg/m 3 ) and high thermal conductivity (up to 60 W/(m•K)) [2]. Thus, porous CCCM with a relatively low density and a far smaller thermal conductivity appear to have a great potential [3,4].…”

“…The probable characteristics of porous CCCM with the woven and non-woven reinforcement are theoretically validated in [4]. The heat conductivity analysis of the porous CCCM (with 1000-2000 kg/m 3 density) accounting for the radiative heat transfer in the pores is conducted in [5].…”

Thermostabilizing annealing analysis of organomorphic preforms made of oxidized polyacrylonitrile

“…The methods for obtaining reinforced frames made of composite materials are characterized by a large variety of technologies and equipment [1]. Nowadays researchers' attention is drawn to organomorphic frames that consist of carbonized pressed polyacrylonitrile (PAN) [2][3][4][5][6]. In the manufacturing of reinforced carbon-carbon (RCC) and ceramic matrix composites (CMC) as a feedstock both PAN tows or nonwoven pressed samples are used.…”

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.…”