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Mechanism of Densification of C/C Composites Fabricated with High Density Preform

Author(s): LI Jian-Li, SU Zhe-An, ZHANG Ming-Yu, YANG Xin, HUANG Qi-Zhong

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 26;
Issue: 7;
Start page: 711;
Date: 2011;
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Keywords: C/C composites; multi-stage CVI; sealed pores; densification; high temperature treatment

With C3H6 as the precursor, N2 as the carrier gas and high density 3D carbon fiber braided preform, the plate of C/C composites was fabricated by the fast CVI process. Influence of gradient pressure and other factors of process on the sealed pores in C/C composites were analyzed, and the morphologies were characterized by scanning electron microscope (SEM) and polarized light microscope (PLM) in detail. The formation mechanism of sealed pores and the transformation of density in high density preform in the densification process are simply analysized. The experimental results show that the sealed pores can be reduced by multi―stage CVI process and the density of the C/C composite are improved from 0.94g/cm3 to 1.82g/cm3 after 250 h CVI process.

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