Fabrication and Microstructure of C/SiC Composites Using a Novel Heaterless Chemical Vapor Infiltration Technique

• Published in: Journal of the American Ceramic Society Vol. 88; no. 11; pp. 3253 - 3255
• Main Authors: Tang, Sufang, Deng, Jingyi, Du, Haifeng, Liu, Wenchuan, Yang, Ke
• Format: Journal Article
• Language: English
• Published: Oxford, UK Blackwell Science Inc 01.11.2005; Blackwell; Wiley Subscription Services, Inc
• Subjects: Applied sciences; Building materials. Ceramics. Glasses; Ceramic industries; Cermets, ceramic and refractory composites; Chemical industry and chemicals; Composite materials; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Materials science; Microstructure; Nanostructured ceramics; Other materials; Permeability; Physics; Specific materials; Structural ceramics; Technical ceramics; Ceramic matrix composite; Scanning electron microscopy; Silicon carbide; Fiber reinforced material; Chemical vapor infiltration; Manufacturing; Experimental study; Microstructure; Composite material; Non oxide ceramics; Structural ceramic; Carbon fiber
• ISSN: 0002-7820; 1551-2916
• DOI: 10.1111/j.1551-2916.2005.00571.x

Fabrication of C/SiC composites by using the heaterless chemical vapor infiltration (HCVI) technique, which is an improved technology based on the conventional chemical vapor infiltration, is reported for the first time in this paper. In the HCVI process, a gradient temperature field formed in the fiber preform overcomes the problems of slow diffusion and restricted permeability of gaseous reactant species to some extent, and the electro‐deposition is necessary to accelerate the SiC deposition rates. The highest linear deposition rates of SiC matrix within inter‐fiber pores are 0.33 μm/h. Microstructures of the C/SiC composites are uniform, and the inter‐fiber and inter‐ply pores can be well infiltrated. The longitudinal and circumferential microcracks are found in the composites.