Improved thermal shock resistance of SiCnw/PyC core-shell structure-toughened CVD-SiC coating

In-situ SiC nanowire (SiCnw)/pyrolytic carbon (PyC) core-shell structures were introduced to mainly improve the thermal shock performance of chemical vapor deposition (CVD)-SiC coating on carbon/carbon (C/C) composites. The microstructure, phase composition, and mechanical properties of the CVD-SiC...

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Bibliographic Details
Published inJournal of the European Ceramic Society Vol. 38; no. 7; pp. 2808 - 2814
Main Authors Zhuang, Lei, Fu, Qian-Gang, Yu, Xin
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.07.2018
Subjects
C/C composites
Chemical vapor deposition
SiC coating
SiCnw/PyC core-shell structures
Thermal shock resistance
SiCnw/PyC core-shell structures
SiC coating
Thermal shock resistance
Chemical vapor deposition
C/C composites
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Summary:In-situ SiC nanowire (SiCnw)/pyrolytic carbon (PyC) core-shell structures were introduced to mainly improve the thermal shock performance of chemical vapor deposition (CVD)-SiC coating on carbon/carbon (C/C) composites. The microstructure, phase composition, and mechanical properties of the CVD-SiC coating toughened by SiCnw/PyC core-shell structures were studied as well. The results show that the introduction of SiCnw/PyC core-shell structures can effectively alleviate the mismatch of coefficient of thermal expansion (CTE) between SiC coating and C/C substrate, thus enhancing the thermal shock resistance of the coating. Furthermore, the increased numbers of interfaces in the SiC coating owing to the addition of core-shell structures are beneficial to the mechanical properties of the coating after thermal shock test.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2018.02.017