Influence of the porosity of C/C on the characterization of C/C-SiC composite prepared by reactive melt infiltration method

Wang Jiping; Jin Zhihao; Lin Min; Zhang Yonghui

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Influence of the porosity of C/C on the characterization of C/C-SiC composite prepared by reactive melt infiltration method

Wang Jiping *,Jin Zhihao ,Lin Min,Zhang Yonghui

School of Materials Science and Engineering, Xi’an Jiaotong University

*Correspondence author

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Funding: 教育部博士点基金，国家自然科学基金（No.20070698104,50272051）

Opened online:23 May 2008

Accepted by: none

Citation: Wang Jiping,Jin Zhihao ,Lin Min.Influence of the porosity of C/C on the characterization of C/C-SiC composite prepared by reactive melt infiltration method [OL]. [23 May 2008] http://en.paper.edu.cn/en_releasepaper/content/21714

C/C performs with four different open porosities in the range of 12.4%~45.7% were reactive-melt-infiltrated (RMI) with silicon to rapidly fabricate C/C-SiC composites. The influence of the C/C porosity on the Si infiltration during the processing and on the microstructure and mechanical properties of the resulting C/C-SiC composites were investigated by means of density measurement, XRD, SEM, and three-point bending test, respectively. The results show that the higher porosity of C/C brought more silicon infiltration during RMI processing. The porosity also played a key role to dominate the content of β-SiC, residual Si and C phases, as well as the porosity of the resulting C/C-SiC composites. The flexural strength and the fracture behavior of the composites were strong influenced by the matrix content and the interface between different phases. C/C-SiC derived from C/C with 24.8% porosity has the highest flexural strength (325.1MPa) and shows a brittle fracture behavior.

Keywords: C/C-SiC; open porosity; reactive melt infiltration; mechanical property; microstructure

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