Reactive hot-pressing of ZrB₂-ZrC-SiC ceramics via direct addition of SiC

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• 作者：Ying Lu^a ; ^c ; Guo-Jun Zhang^b ; ^{gjzhang@dhu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Ji-Xuan Liu^a ; Hu-Lin Liu^a ; ^c ; Xin-Gang Wang^a ; Fang-Fang Xu^a
• 关键词：Reactive hot-pressing ; Zirconium diboride ; Micro-layered structure
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：15 November 2016
• 年：2016
• 卷：42
• 期：15
• 页码：16474-16479
• 全文大小：2703 K

文摘

A series of ZrB₂-ZrC-SiC composites with various SiC content from 0 to 20 vol% were prepared by reactive hot-pressing using Zr, B₄C and SiC as raw materials. Self-propagating high-temperature synthesis (SHS) occurred, and ZrC grains connected each other to form a layered structure when the SiC content is below 20 vol%. The evolution of microstructure has been discussed via reaction processes. The composite with 10 vol% SiC presents the most excellent mechanical properties (four-point bending strength: 828.6±49.9 MPa, Vickers hardness: 19.9±0.2 GPa) and finest grain size (ZrB₂: 1.52 µm, ZrC: 1.07 µm, SiC: 0.79 µm) among ZrB₂-ZrC-SiC composites with various SiC content from 0 to 20 vol%.