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

doi:10.3724/SP.J.1077.2011.00711

Abstract

Abstract: With C₃H₆as 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/cm³after 250 h CVI process.

Key words: C/C composites, multi-stage CVI, sealed pores, densification, high temperature treatment

CLC Number:

TB332

LI Jian-Li, SU Zhe-An, ZHANG Ming-Yu, YANG Xin, HUANG Qi-Zhong. Mechanism of Densification of C/C Composites Fabricated with High Density Preform[J]. Journal of Inorganic Materials, 2011, 26(7): 711-714.

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