FABRICATION OF 3D-CARBON FIBER REINFORCED SiC COMPOSITES BY SLURRY INFILTRATION AND CVI JOINT PROCESS

摘要

In order to search for an effective manufacturing process of 3D-fiber reinforced / ceramic matrix composite, 3D-carbon fiber / SiC composite have been tried to fabricate by a joint process consisting of slurry infiltration (SI), polymer infiltration and pyrolysis( PIP) and pressure-pulsed CVI(PCVI). For matrix filling into pores of 3D-carbon fiber preform, ～ 40, ～ 17 and ～ 30 % of total pore volume in a preform can be filled with matrix by SI, PIP and PCVI, respectively. Densification of matrix filling can be performed up to 6 % of residual porosity for the sample having 1 mm thickness and to 9 % for 3.5 mm thickness by the joint process. Optimum processing conditions for the joint process as well as mechanical properties of the composites were investigated. The highest room-temperature tensile and flexural strengths and tensile elastic modulus of 3D-carbon fiber / SiC composites were 474 MPa, 550 MPa and 231 GPa, respectively.