Influence of the Porosity of C/C on the Characterization of C/C-SiC Composites Prepared by Reactive Melt Infiltration Method

Abstract:

C/C-SiC composites were rapidly fabricated using C/C with four different porosities in the range of 12.4%~45.7% and silicon by reactive-melt-infiltrated (RMI) method. 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 were investigated. The results show that β-SiC was formed by Si/C reaction and free Si remained in the composites. A higher porosity of C/C leads more Si infiltrating to the preform and produces higher density of C/C-SiC with lower porosity. The flexural strength of the composites was 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).

• Periodical: Materials Science Forum (Volumes 620-622)
• Pages: 371-374
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.620-622.371
• Online since: April 2009
• Authors: Jiping Wang, Min Lin, Yong Hui Zhang, Zhuo Xu, Zhi Hao Jin
• Keywords: C/C-SiC, Mechanical Property, Microstructure, Porosity, Reactive Melt Infiltration

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