Synthesis of SiC nanowires with in-situ deposition of carbon coating.
SiC nanowires are effective reinforcement materials in ceramic matrix composites. A compliant coating such as carbon on nanowires is necessary in order to moderate the nanowire/matrix interfacial bounding for taking the most advantages of SiC nanowires. SiC nanowires with an in-situ deposition of carbon shell coating were fabricated by a novel chemical vapor growth process. Highresolution transmission electron microscopy examinations showed that the nanowires consisted of a single crystal beta-SiC core with an amorphous carbon shell 2-5 nm in thickness. The nanowires were straight with a length generally over 10 microm and a diameter 15-150 nm. The growth direction of the core SiC nanowires is (111). A simple three-step growth model for SiC nanowires was proposed based on a vapor-solid growth mechanism. Because the carbon-coated nanowires were grown directly on continuous Tyranno-SA SiC fibers, in-situ application of the present technique on the fabrication of SiC nanowire-reinforced SiC/SiC composites is expected.
Yang
Wen
W
National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan.
Araki
Hiroshi
H
Tang
Chengchun
C
Hu
Quanli
Q
Suzuki
Hiroshi
H
Noda
Tetsuji
T
D002244:Carbon / Q000737:chemistry*; D004559:Electric Wiring; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D036103:Nanotechnology / Q000379:methods*; D012825:Silicon / Q000737:chemistry*
D002244:Carbon; D012825:Silicon