Gel-cast hierarchical porous B4C/C preform and its role in fabricating reaction bonded boron carbide composites
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- 作者：Yufeng Xu ; Hongqiang Ru ; ruhq@smm.neu.edu.cn ; Haibo Long ; Jing Zhao ; Wei Wang ; wangw@atm.neu.edu.cn ; Xinyan Yue
- 关键词：Gel-casting ; Liquid silicon infiltration ; Boron carbide ; Mechanical properties
- 刊名：Ceramics International
- 出版年：2017
- 出版时间：1 April 2017
- 年：2017
- 卷：43
- 期：5
- 页码：4062-4067
- 全文大小：1748 K
- 卷排序：43
文摘
The resorcinol-formaldehyde (RF) gel-casting system is employed for the first time to fabricate a hierarchical porous B4C/C preform, which was subsequently used for the fabrication of reaction bonded boron carbide (RBBC) composites via a liquid silicon infiltration process. The effect of the carbon content and carbon structures of this perform on the microstructures and mechanical properties of B4C/C preform and the resultant RBBC composites is reported. The B4C/C preform (16 wt% carbon) exhibit a strength of 34±1 MPa. The obtained RBBC composites shown uniform microstructure is consisted of SiC particles bonded boron carbide scaffold and an interpenetrating residual silicon phase. The Vickers hardness, flexural strength and fracture toughness of the RBBC composites (16 wt% carbon) are 24 GPa, 452 MPa and 4.32 MPa m1/2, respectively.