Preparation of B₄C composites toughened by TiB₂-SiC agglomerates

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• 作者：Xiaorong Zhang^a ; Zhixiao Zhang^b ; ^{zhixiao351@hebeu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; ^{zhixiao351@163.com" class="auth_mail" title="E-mail the corresponding author} ; Weimin Wang^c ; Xiaoliang Zhang^b ; Jingbo Mu^b ; Guangsuo Wang^b ; Zhengyi Fu^c
• 关键词：B4C composites ; Reactive hot pressing ; Microstructure ; Toughening mechanism ; Composite structural toughening phase
• 刊名：Journal of the European Ceramic Society
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：37
• 期：2
• 页码：865-869
• 全文大小：1440 K

文摘

High-performance B₄C composites toughened by TiB₂-SiC agglomerates were fabricated via reactive hot pressing with B₄C, TiC and Si as raw materials. The TiB₂-SiC composite serves as a composite toughening phase formed in the B₄C matrix through an in situ reaction; its agglomerates are composed of interlocked TiB₂ and SiC, which can remarkably improve the toughness of the B₄C composites. The Vickers hardness, flexural strength and fracture toughness of the B₄C-TiB₂-SiC composite reached 35.18 ± 0.45 GPa, 567 ± 14 MPa, and 6.38 ± 0.18 MPa m^1/2 respectively. The special toughening structure of the TiB₂-SiC composite introduced into B₄C ceramics was evaluated for the first time in this study.