Continuous synchronous composite process for fabricating carbon/silicon carbide composites

The continuous synchronous composite (CSC) process is a new technique, the preparation of reinforcement-phase accompanied simultaneously the depositio n of SiC matrix, based on CVI principles for fabrication of ceramic matrix composites. In the CSC process, there was a gradient temperature field on t he surface of the graphitic substrate, consisting of high (1000-1200 degree sC), intermediate (900-1000 degreesC) and low (700-900 degreesC) temperatur e regions, by a bottom heating-element. Following the rotating substrate, m icro-pores were well infiltrated in the intermediate temperature regions by gas diffusion transport, and macro-pores were rapidly filled with SiC in t he high temperature regions by gas flow transport, respectively. In the pre sent paper, 2-dimension carbon cloth reinforced SiC composites was fabricat ed by CSC process, and the microstructure, deposition rate and conversion e fficiency of methyltrichlorosilane (MTS) were investigated. The densificati on of C/SiC composites was uniform, and the highest deposition rate within macro-pores was 25 mum h(-1) , and the conversion efficiency of MTS varied from 11% to a maximum of 27%. (C) 2001 Elsevier Science B.V. All rights res erved.