High toughness in pressureless densified ZrB₂-based composites co-doped with boron-titanium carbides

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• 作者：Jie Yin ; Hui Zhang ; Yongjie Yan ; Zhengren Huang ; ^{zhrhuang@mail.sic.ac.cn} ; Xuejian Liu ; Dongliang Jiang
• 关键词：ZrB2 ; Particulate-reinforced composites ; Microstructure ; Toughness
• 刊名：Scripta Materialia
• 出版年：2012
• 期刊代码：157_13596462
• 类别：et
• 出版时间：April, 2012
• 卷：66
• 期：8
• 页码：523-526
• 文件大小：621 K

摘要

ZrB₂-based ceramics were pressureless sintered at 2100 掳C, with the co-incorporation of B₄C and TiC. Levels of toughness as high as 4.1 卤 0.3 MPa m^1/2 for ZrB₂-TiB₂-B₄C and (6.5 卤 0.5) MPa m^1/2 for ZrB₂-SiC-TiB₂-B₄C were achieved. Carbon and TiB₂ were formed in situ as densification aids. Carbon effectively removed surface oxide impurity, while TiB₂ formed a solid solution with ZrB₂, inhibiting grain growth and promoting densification. Other mechanical properties were also reported.