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Research Article | Open Access

Effect of BNNTs/matrix interface tailoring on toughness and fracture morphology of hierarchical SiCf/SiC composites

Guangxiang ZHUa,b,c, Qian FENGd, Jinshan YANGa,b( ), Jianbao HUa,b, Hongda WANGa,b, Yudong XUEa,b,c, Qingliang SHANa,b,c, Shaoming DONGa,b( )
State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
Structural Ceramics and Composites Engineering Research Center, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
University of Chinese Academy of Sciences, Beijing 100049, China
Analysis and Testing Center, Donghua University, Shanghai 201600, China
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Abstract

A thin BN interphase is applied on BNNTs surface to tailor the interfacial bonding between BNNTs and SiC matrix in hierarchical SiCf/SiC composites. The thickness of BN interphase ranging from 10 to 70 nm can be optimized by chemical vapor deposition after BNNTs are in situ grown on SiC fiber surface. Without BN interphase, the fracture toughness of hierarchical SiCf/SiC composites can be impaired by 13.6% due to strong interfacial bonding. As long as BN interphase with 30-45 nm thickness is applied, the interfacial bonding can be optimized and fracture toughness of hierarchical composites can be improved by 27.3%. It implies that tailoring BNNTs/matrix interface by depositing a layer of BN interphase is in favor of activating energy dissipation mechanisms at nanoscale induced by BNNTs.

Keywords

boron nitride nanotubes (BNNTs)interfacenanocompositestoughness and toughening

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Journal of Advanced Ceramics
Volume 8 Issue 4,
December 2019
Pages 555-563
DOI: 10.1007/s40145-019-0338-0

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Cite this article:
ZHU G, FENG Q, YANG J, et al. Effect of BNNTs/matrix interface tailoring on toughness and fracture morphology of hierarchical SiCf/SiC composites. Journal of Advanced Ceramics, 2019, 8(4): 555-563. https://doi.org/10.1007/s40145-019-0338-0

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Received: 28 December 2018
Revised: 24 March 2019
Accepted: 03 May 2019
Published: 04 December 2019
© The author(s) 2019

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