Tailoring Carbon Fiber/Carbon Nanotubes Interface To Optimize Mechanical Properties Of C-F-Cnts/Sic Composites
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY(2014)
摘要
C-f/SiC composites were fabricated using fiber coatings including CNTs and matrix infiltration using the polymer impregnation and pyrolysis process. Interface between fiber and CNTs (CF/CNTs) was tailored to optimize mechanical properties of hybrid composites. The tailored interphases, such as Pyrocarbon (PyC) and PyC/SiC, protect fibers from degradation during the growth of CNTs successfully. Hybrid composites with well-tailored CF/CNTs interface displayed significantly increased mechanical strength (352 +/- 21 MPa) compared with that (34 +/- 3 MPa) of composites reinforced with CNTs, which grown on carbon fibers directly. The interfacial bonding strength of hybrid composites was improved and optimized by tailoring the CF/CNTs interface. Interfacial failure modes were studied, and a firm interface bonding at the joint where CNTs grown was observed.
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