Gel-cast hierarchical porous B4C/C preform and its role in fabricating reaction bonded boron carbide composites

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...

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Bibliographic Details
Published inCeramics international Vol. 43; no. 5; pp. 4062 - 4067
Main Authors Xu, Yufeng, Ru, Hongqiang, Long, Haibo, Zhao, Jing, Wang, Wei, Yue, Xinyan
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.04.2017
Subjects
Boron carbide
Gel-casting
Liquid silicon infiltration
Mechanical properties
Gel-casting
Mechanical properties
Liquid silicon infiltration
Boron carbide
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Summary: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 (16wt% carbon) exhibit a strength of 34±1MPa. 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 (16wt% carbon) are 24GPa, 452MPa and 4.32MPam1/2, respectively.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2016.11.193