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allied
academies
Materials-Metals 2017
Page 57
November 16-17, 2017 Paris, France
13
th
Annual Conference on
Materials Science, Metal and Manufacturing
Journal of Materials Science and Nanotechnology
Volume 1 Issue 2
SiC nanowires/ribbons reinforced high-
temperature ceramic coatings
Yanhui Chu
South China University of Technology, China
C
arbon/carbon (C/C) composites are prone to oxidize
and ablate at elevated temperatures, which limits their
applications as high-temperature structural materials. The
ceramic coatings are considered to be the effective methods to
solve this problem. However, the intrinsic brittleness of these
coatings and the mismatch of the poor interfacial bonding
between these coatings and C/C substrate often give rise to
the cracking of the coatings, which results in the failure of the
coatings. To solve these problems, in our work, the ceramic
coatings reinforced by the well-dispersion SiC nanowires/
ribbons with different morphology and aspect ratios were
proposed and prepared by chemical vapor deposition, in-situ
synthesis and pack cementation. The as-prepared coatings
possessed the excellent oxidation protective ability, which
achieved the oxidation protective of silicon-based ceramic
coatings for C/C composites between 1500 °C and room
temperature. Our study not only revealed the traditional
toughening mechanisms of SiC nanowires/ribbons including
nanowire/ribbon pull-out, nanowires/ribbon bridging, crack
deflection and microcrack toughneing, but also revealed the
novel toughening mechanisms of SiC nanowires including
the plasticity deformation of the nanowires, the plasticity
fracture at the interface of the nanowire-matrix, and the
generated special mechanical interlocking. In addition, our
study also discovered that the interfacial bonding strength
of carbon and ceramic materials with other materials was
improved significantly by in-situ synthesizing SiC nanowires/
ribbons on their surface, and revealed the novel interface
anchoring mechanisms of SiC nanowires/ribbons involving
the interfacial bonding anchoring and the mechanical
interlocking anchoring.
chuyh@scut.edu.cnMater Sci Nanotechnol 2017, 1:2