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Microstructure and Mechanical Properties of Cf/SiC Composites Reinforced with Boron Nitride Nanowires
G. Zhu1,2,3, S. Dong1,3, J. Hu1,3, Y. Kan1,3, L. Gao1,3, X. Zhang1,3, Z. Wang1,3, Y. Ding1,3
1 Structural Ceramics and Composites Engineering Research Center, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
2 University of Chinese Academy of Sciences, Beijing 100049, China
3 State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
received August 31, 2016, received in revised form October 20, 2016, accepted November 11, 2016
Vol. 8, No. 1, Pages 31-38 DOI: 10.4416/JCST2016-00064
Abstract
Boron nitride nanowires (BNNWs) were first grown in situ into fiber preforms, and then Cf/SiC composites reinforced with the BNNWs were fabricated by means of chemical vapor infiltration (CVI) matrix densification. It was found that thanks to the incorporation of the BNNWs, the matrix of the Cf/SiC composites at micron scale is toughened notably, as evidenced by the results of indentation tests. Synergetic strengthening and toughening mechanisms including debonding, fracture, pullouts as well as crack branching and deflection attributed to BNNW-based micro-rods are observed. However, no significant increases in flexural strength and fracture toughness are obtained for the composites, possibly owing to the lower density of composites and strong interface bonding between the BNNWs and the matrix.
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Keywords
Ceramic matrix composites, boron nitride nanowires, bending test, microindentation, toughness
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