The control of interfacial bonding state and optimization of mechanical properties of Si3N4f/BN/Si3N4 composites via different synthesis technologies

Silicon nitride fibers-reinforced silicon nitride matrix (Si3N4f/BN/Si3N4) composites with a BN interphase were fabricated by chemical vapor infiltration (CVI) and precursor infiltration pyrolysis (PIP). It is shown that PIP Si3N4f/BN/Si3N4 composites possessed better mechanical properties and achie...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2021-02, Vol.41 (2), p.1739-1746
Main Authors: Zhou, Jie, Cheng, Laifei, Ye, Fang, Zhang, Litong, Liu, Yongsheng, Cui, Xuefeng, Fu, Zhiqiang
Format: Article
Language:English
Subjects:
Interfacial bonding state
Mechanical properties
Modulus matching relationship
Si3N4f/BN/Si3N4composites
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Summary:Silicon nitride fibers-reinforced silicon nitride matrix (Si3N4f/BN/Si3N4) composites with a BN interphase were fabricated by chemical vapor infiltration (CVI) and precursor infiltration pyrolysis (PIP). It is shown that PIP Si3N4f/BN/Si3N4 composites possessed better mechanical properties and achieved effectively interface debonding and fiber pull-out, whose flexural strength and fracture toughness can achieve 189 ± 17 MPa and 5.6 ± 0.6 MPa·m1/2, about twice and 1.5 times as much as those of CVI Si3N4f/BN/Si3N4 composites, respectively. Combining the micro-nano mechanical and macro-mechanical properties investigations, it is revealed that weakening the interfacial bond and achieving proper modulus matching relationship between fibers and matrix by PIP process could remarkably increase the mechanical properties of the Si3N4f/BN/Si3N4 composites, compared with CVI process.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2020.09.041