Preparation of C_f/SiC Composites by Chemical Liquid-Vapor Deposition Process

Abstract:

The conversion of the liquid polycabosilane (LPCS) into silicon carbide was investigated by IR, XRD, which indicated the feasibility of the transition from LPCS to SiC ceramics above 900°C. The FTIR spectra and XRD Pattern of the C_f/SiC composites show that the matrix deposited at 1200°C has silicon carbide structure with the crystallite size of β-SiC phase of about 41 nm, while the SiC phase is amorphous at 900°C. The carbon fiber reinforced silicon carbide composites (C_f/SiC) were hereby prepared at 900°C and 1200°C, through chemical liquid-vapor deposition (CLVD) process using LPCS as precursor. Flexural strength of 224 MPa for C_f/SiC specimen with density of 1.81g·cm^-3 was obtained after being prepared at 1200°C for 30 minutes. The load-deflection curve has shown that the fracture behavior of the C_f/SiC composites is a typical non-brittleness. The results indicate that the CLVD process has a great advantage and prospect to prepare C_f/SiC composites in future.

• Periodical: Key Engineering Materials (Volumes 512-515)
• Pages: 804-807
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.512-515.804
• Online since: June 2012
• Authors: Min Mei, Xin Bo He, Xuan Hui Qu, Hai Feng Hu, Yu Di Zhang, Si An Chen
• Keywords: C_f/SiC Composites, Chemical Liquid-Vapor Deposition, Microstructure

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