Improved Oxidation Resistance of SiС-Based Ceramic Matrix Composites by In Situ Reaction with Si₃N₄ Filler

Abstract:

SiC-Si₃N₄ powders and modified SiC-based ceramic matrix composites (CMCs) were fabricated using polycarbosilane (PCS), divinylbenzene (DVB) and Si₃N₄ filler. Si₃N₄ was introduced into CMCs fabricated through polymer infiltration and pyrolysis (PIP) to lower down the carbon content by in-situ carbothermal reaction, which derived from pyrolyzed PCS-DVB. The oxidation resistance and three point bending strength of modified C/SiC composites were effectively enhanced. The phase composition, microstructure of SiC-Si₃N₄ powders and modified C/SiC composites were investigated by XRD, SEM and TEM.

• Periodical: Key Engineering Materials (Volumes 512-515)
• Pages: 775-778
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.512-515.775
• Online since: June 2012
• Authors: Bin Wu, Zhen Wang, Shao Ming Dong
• Keywords: Si₃N₄, Mechanical Property, Oxidation Resistance, SiC-Based Composites

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