Journal
CERAMICS INTERNATIONAL
Volume 47, Issue 21, Pages 30777-30789Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2021.07.258
Keywords
C/C-SiC; Natural gas; Wetting behavior; Liquid silicon infiltration
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Funding
- National Natural Science Foundation of China [52075555]
- Special Funds for the Construction of Innovative Provinces of Hunan Province [2020GK2063]
- Natural Science Foundation of Hunan Province [2020JJ2682]
- State Key Laboratory of Powder Metallurgy
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This study investigated the microstructure and properties of C/C-SiC composites derived from different gaseous precursors, revealing that the n-C/C-SiC composite showed higher flexural strength and coefficient of friction, as well as lower linear wear rates compared to the p-C/C-SiC composite.
The type of gaseous precursors has a profound influence on the microstructure and properties of carbon fiber based ceramic brake materials. In this work, C/C-SiC composites derived from natural gas (n-C/C-SiC) and propylene (p-C/C-SiC) were prepared by a combined process (chemical vapor infiltration (CVI) and reactive melt infiltration (RMI)), and the microstructure and properties of C/C-SiC composites were investigated. Results indicate that the structure of PyC were a mixed structure with rough surface (rough laminar structure + smooth laminar structure) and smooth laminar structure in n-C/C and p-C/C respectively. And then the rough surface of PyC in n-C/C preform resulted in a smaller crystal size of nano-SiC and mechanisms of liquid silicon infiltration were proposed. Moreover, compared to the p-C/C-SiC composite, the flexural strength and coefficient of friction (COF) of the n-C/C-SiC composite were increased to 208.49(+/- 22.71) MPa and 0.41 respectively and exhibit a relatively stable braking process with lower liner wear rates (LWR).
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