Low Cost Processing for C/C-SiC Composites by Means of Liquid Silicon Infiltration

Thermal-diffusivity measurement of 3D-stitched C–SiC composites

“…Many researchers have proposed models for predicting thermal diffusivity for ceramic composites which cannot be used for 3D-stitched C-SiC composites due to different fiber architecture. Temperature of the silicon infiltration in carbon performs is reported from 1420-1600 • C [3][4][5]7,8,11 while time of silicon infiltration has been reported from few seconds to 2 h 5,7,8 depending on the size of the job. To select an optimum siliconization conditions for jet-vane size C-SiC composites a systematic study on the effect of siliconization conditions on thermal-diffusivity has been carried out.…”

“…Many researchers have published thermal-diffusivity data for LSI based 2D C-SiC composites. 4,5 To achieve better thermal properties in all the three directions 3D-stitched C-SiC composites are proposed for jet-vanes applications. Coal-tar pitch has been proposed to use as a carbon precursor to fabricate 3D C-SiC composites.…”

Investigation of thermal expansion of 3D-stitched C–SiC composites

“…Many researchers have reported CTE data for LSI based 2D C-SiC composites. 4,5 It is much higher in the throughthickness direction as compared to that in the in-plane direction, which may lead to thermal shock failure.…”

“…The composition and microstructure of these composites would depend upon siliconization conditions and on the rate of cooling. 6,7 The temperature of silicon infiltration in the carbon performs has been reported to be in the range 1420-1600 • C. [3][4][5][6]9 The infiltration time ranges from a few minutes to 2 h depending on the size of the C-C preform. 5,6 CTE of composites can be explained and estimated by the rule of mixtures 8 but for complex fiber architectures estimation is difficult.…”

Carbon fiber/reaction-bonded carbide matrix for composite materials – Manufacture and characterization

“…1,2 CMC are processed according to: (i) the gas phase route (CVI: chemical vapor infiltration), 3 (ii) the liquid phase routes either from polymers (PIP: polymer impregnation and pyrolysis), 4,5 or molten elements reacting with ceramic charges in the preforms or with the atmosphere (RMI: reactive melt infiltration), 6 (iii) the ceramic route, i.e. a technique combining the impregnation of the reinforcement with a slurry and a sintering step at high temperature and high pressure (SI-HP: slurry infiltration and hot processing) 7,8 or finally (iv) some hybrid processes, [9][10][11][12][13][14][15][16] i.e. a combination of the gas-liquid and ceramic routes in order to associate the advantages of each previous process and to avoid their drawbacks.…”