Effect of SiCnws on flexural strength of SiCf/HfC-SiC composites after impact and ablation. Issue 13 (October 2021)

• Record Type: Journal Article
• Authors: Feng, Tao; Hou, Wanbo; Tong, Mingde; Li, Hejun; Lin, Hongjiao; Wen, Shifeng
• Is Part Of: Journal of the European Ceramic Society. Volume 41:Issue 13(2021)
• Page Start: 6171
• Page End: 6180
• Publication Date: 2021-10
• Subjects: Ultra-high temperature ceramics -- Nanowire -- Flexural strength -- Impact -- Ablation; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2021.06.051
• Languages: English
• ISSNs: 0955-2219

Abstract

Highlights: SiCf /HfC-SiC and SiCnws modified SiCf /HfC-SiC composites were prepared by PIP and CVI methods. SiCnws were helpful to increase the pyrolysis yield rate of HfC precursor. After impact-ablation, the flexural strength of SiCf /HfC-SiC reduced by 45.2 %; that of modified one only reduced by 30.9 %. Abstract: SiC nanowires (SiCnws ) modified SiCf /HfC-SiC composites were prepared by precursor infiltration and pyrolysis (PIP) and chemical vapor infiltration (CVI) methods. The microstructure, flexural strengths, impact and impact-ablation tests of the composites with and without SiCnws were investigated. The results showed that after introducing SiCnws, not only the retention rate of HfC ceramic produced by PIP was increased obviously, but also the fracture displacement of the modified composites was reduced due to the enhancement effect of SiCnws at interface between SiC fiber and matrix. After impact and impact-ablation, the strength retention of SiCnws modified composites was 91.6 % and 69.1 % respectively, higher than that of the composites without SiCnws (85.2 % and 54.8 %). As the impact resistance of the modified composites was improved by the pull-out and bridging of SiCnws, the ablation resistance of the impacted composites was enhanced as well.