Paper number 952

FABRICATION AND CHARACTERIZATION OF 3D CARBON-FIBER/SIC COMPOSITES BY SLURRY - PULSE CVI JOINT PROCESS

K. Suzuki, K. Nakano and T.W. Chou

National Industrial Research Institute of Nagoya, Nagoya(Japan)
Japan Ultra-high Temperature Materials Research Institute, Tajimi(Japan)
Center for Composite Materials, University of Delaware, Newark DE(USA)

Summary For the sake of constructing a process for fabrication of small and medium scale CMCs parts, slurry-pulse CVI joint process has been trying to apply for making 3D carbon-fiber/SiC composites. The pulse CVI process was finally applied for a composite body made by a process consisting of slurry and polycarbosilane infiltrations and pyrolysis. The pulse CVI was carried out by using a source gas system of SiCl4-CH4-H2. Crystalline phases deposited by the pulse CVI varied with temperature, gas concentration and reaction time. At 1373K, a large amount of SiC deposition into matrix was observed, and the deposition rate was at least twice higher than that for CH3SiCl3-H2 system in the previous work. Model structure of composite after each process were proposed. Flexural strength of composite remarkably increased after the pulse CVI application.
Keywords 3D carbon fiber, SiC matrix composite, slurry infiltration, Pulse CVI, Joint fabrication process.

Theme : Ceramic Matrix and C/C Composites

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