• Journal of Inorganic Materials
  • Vol. 36, Issue 10, 1111 (2021)
LI Longbin1、2, XUE Yudong1、2, HU Jianbao1、2, YANG Jinshan1、2, ZHANG Xiangyu1、2, and DONG Shaoming1、2、*
Author Affiliations
  • 11. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
  • 22. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
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    Abstract

    SiC fiber (SiCf)/SiC composites were modified by SiC nanowires (SiCnw) grown in-situ on SiC fiber to obtain hierarchical structure. Effects of this hierarchical structure on the properties of composites, such as microstructure, fracture strength and damage evolution, were evaluated. Results show that the introduction of SiCnw significantly improves the matrix infiltration efficiency. SiCnw and BN-coated SiCnw reinforced SiCf/SiC composites acquire better performance in bending tests by comparison with conventional SiCf/SiC. SiCnw coated by BN interphase obviously enhances the strength owing to weak-bonded interface. Besides, results of acoustic emission and Coated Vickers Hardness Impresses reveal that SiCnw delay early damage evolution at early state and mainly make contribution to hindering and bridging of microcracks, which is further enhanced by BN-coated SiCnw.

    Among various types of continuous fibre reinforced ceramic matrix composites (CMCs), SiC fiber (SiCf)-reinforced SiC matrix composites (SiCf/SiC) with superior mechanical and thermal properties have obtained increasing attention in industrial applications like aerospace, nuclear and braking system over past few decades[1,2,3]. However, major issues like sensitivity to structural defects and brittle behavior in external load require effective solution for optimizing the performance of SiCf/SiC in application[4]. Nanotubes-reinforced hierarchical composites introduce a practicable way to handle the issues due to their significant improvement in toughness and strength[5]. Nanotubes such as carbon nanotubes (CNTs) and boron nitride nanotubes (BNNTs) present better mechanical properties by enhancing brittle microstructural parts relatively away from fiber bundles, monolithic composites are efficiently toughened and strengthened owning to ductile behavior like sliding, pull-out and bridging of these micro-scale counterparts of fibers[6,7]. Apart from CNT and BNNT, SiCnw and SiC whisker with high tensile modulus and strength also acquire good performance as hierarchical reinforcement in both Cf/SiC and SiCf/SiC composites owing to their restriction effect on crack propagation in and into fiber bundles[8].

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    Longbin LI, Yudong XUE, Jianbao HU, Jinshan YANG, Xiangyu ZHANG, Shaoming DONG. Influence of SiC Nanowires on the Damage Evolution of SiCf/SiC Composites [J]. Journal of Inorganic Materials, 2021, 36(10): 1111
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    Category: RESEARCH LETTER
    Received: Jan. 27, 2021
    Accepted: --
    Published Online: Nov. 26, 2021
    The Author Email: DONG Shaoming (smdong@mail.sic.ac.cn)