Processing of Ceramic Matrix Composites

An Overview of Ceramic Matrix Composites

“…Pyrolytic carbon (PyC) interface with a thickness of 200nm was deposited on fiber using C 3 H 6 precursor at 870 o C for 1 h at a reduced pressure of 5 kPa. Then, SiC matrix was infiltrated by low pressure chemical vapor infiltration (LPCVI) process for fabrication of C/SiC composites with density of about 1.7 g/cm 3 and 1.9 g/cm 3 respectively [10][11][12]. Next, two layer of Si-B-C matrix and two layer of SiC matrix were infiltrated alternatively in sequence for specimen with density of 1.7 g/cm 3 , then, three layers of SiC coating were deposited on specimen, which was marked as C/(SiC-SiBC) m .…”

“…Carbon fiber reinforced SiC matrixes composites (C/SiC) have been extensively studied due to attractive properties, such as low density and high specific strength . Recently, C/SiC composites are promising materials for many applications, especially for aircraft engineer thermo-structural components [10][11][12][13]. However, oxidation of carbon fiber and interface pyrolytic carbon occurs much easily and limits long-term application for C/SiC composites in severe high temperature oxidizing environment [14][15].The C/SiC modified with boron bearing species, such as borosilicate glass,boron,boron carbide and Si-B-C ceramic, shows excellent self-healing property, especially with Si-B-C ceramic.…”

Image segmentation for phase-contrast hard X-ray CMT of C/C composites

“…The problem that arises specifically when imaging C/C composites is linked to the low absorption coefficient of carbon at the used energy, together with the important coherence 1 The program that has been used is Volumic, developed by CREATIS (INSA Lyon/CNRS), with kind permission of F. Peyrin. of the beam, and the order of magnitude of the resolution.…”

“…They are usually produced either by impregnation of a carbon fiber preform by pitches or synthetic mesophases or by chemical vapor infiltration (CVI) [1,2]. The need of enhanced product quality and lower production costs has motivated studies concerning their properties of interest either for direct use (mechanical, thermal) or for processing (permeability, diffusivity, specific surface, ...).…”

Rarefied Pure Gas Transport in Non-isothermal Porous Media: Effective Transport Properties from Homogenization of the Kinetic Equation

“…Such processes are privileged routes for the fabrication of high-quality carbon-carbon and other ceramic-ceramic composites (Naslain, 1999), which are used in various aerospace applications, as well as in braking technology. They involve the penetration of a hot fibrous medium by reactant gases which are transported and eventually react, either homogeneously (by pyrolysis), or heterogeneously, thus yielding a ceramic or carbon deposit, which is going to act as the matrix of the fiber-reinforced composite.…”