期刊
CERAMICS INTERNATIONAL
卷 49, 期 23, 页码 38653-38661出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2023.09.198
关键词
Graphite/SiC composite; Carbon content; Nano carbon black; Reactive melt infiltration
In this study, hybrid carbon powders (PFC@G) adhered with nano carbon black were used as carbon sources to fabricate graphite/SiC composites with a high carbon content. The retention mechanism of the graphite phase was investigated, and it was found that the reaction-formed SiC layer with nano carbon black effectively protected the graphite phase.
For the reaction-formed graphite/SiC composites, the drastic consumption of vast amounts of carbon phase by violent reaction with liquid silicon is a prominent problem during reactive melt infiltration, resulting in low carbon content of the composites. To retain adequate graphite phase, in this work, hybrid carbon powders (PFC@G), adhered with nano carbon black via a binder, were employed as carbon sources for fabricating the graphite/SiC composites with high carbon content. The mechanism of retaining graphite phase in the graphite/ SiC composites by reaction-formed SiC layer with nano carbon black was investigated. The results indicate that a carbon content of 43.03 vol% was obtained for graphite/SiC composites when the content of nano carbon black is 10 wt% in the carbon source. The microscopy results revealed that the PFC@G was protected effectively by the condense layer with fine SiC grains generated via the reaction between nano carbon black and liquid silicon.
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