期刊
CERAMICS INTERNATIONAL
卷 47, 期 3, 页码 3063-3069出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2020.09.142
关键词
Carbon/carbon composites; HfC nanowires; MWCNTs template; Thermal evaporation
资金
- National Natural Science Foundations of China [51772247, 51727804, 91860203]
- Creative Research Foundation of Science and Technology on Thermostructural Composite Materials Laboratory [JCKYS2019607002]
Introducing HfCnws into carbon fiber preforms can improve the mechanical properties of C/C composites. The presence of HfCnws refines the grain size of PyC and significantly enhances the flexural strength of C/C composites.
To improve the mechanical properties of carbon/carbon (C/C) composites, in-situ synthetized single-crystalline hafnium carbide nanowires (HfCnws) were introduced into the carbon fiber preforms by electrophoresis-thermal evaporation method. The Multi-walled carbon nanotubes (MWCNTs) were utilized as the carbon source and templates for forming HfCnws. The microstructure, chemical composition and mechanical properties of the HfCnws modified carbon/carbon (HfCnws-C/C) composites were characterized. Results reveal that HfC is produced preferentially in the inner nodular parts and end parts of MWCNTs. The raising heat-treatment temperature would influence the diffusion rate of Hf atoms and then the number of nucleation sites, which further changed the aspect ratio and morphology of HfCnws. The HfCnws have refined the grain size of pyrolytic carbon (PyC), and significantly improve the flexural strength of C/C composites by 79.3%.
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