HfB2-CNTs composites with enhanced mechanical properties prepared by spark plasma sintering
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- 作者：Hua Jin ; Songhe Meng ; Weihua Xie ; michael@hit.edu.cn ; Chenghai Xu ; Jiahong Niu
- 关键词：B. Composites ; C. Mechanical properties ; E. Structural applications
- 刊名：Ceramics International
- 出版年：2017
- 出版时间：1 February 2017
- 年：2017
- 卷：43
- 期：2
- 页码：2170-2173
- 全文大小：992 K
- 卷排序：43
文摘
HfB2-x vol%CNTs (x=0, 5, 10, and 15) composites are prepared by spark plasma sintering. The influence of CNTs content and sintering temperature on densification, microstructure and mechanical properties is studied. Compared with pure HfB2 ceramic, the sinterability of HfB2-CNTs composites is remarkably improved by the addition of CNTs. Appropriate addition of CNTs (10 vol%) and sintering temperature (1800 °C) can achieve the highest mechanical properties: the hardness, flexural strength and fracture toughness are measured to be 21.8±0.5 GPa, 894±60 MPa, and 7.8±0.2 MPa m1/2, respectively. This is contributed to the optimal combination of the relative density, grain size and the dispersion of CNTs. The crack deflection, CNTs debonding and pull-out are observed and supposed to exhaust more fracture energy during the fracture process.