A micro-Raman investigation of the SCS-6 SiC fiber
作者:
Jeongyong Kim,
Spirit Tlali,
Howard E. Jackson,
James E. Webb,
Raj N. Singh,
期刊:
Journal of Applied Physics
(AIP Available online 1997)
卷期:
Volume 82,
issue 1
页码: 407-412
ISSN:0021-8979
年代: 1997
DOI:10.1063/1.365828
出版商: AIP
数据来源: AIP
摘要:
The microstructure of the SCS-6 SiC fiber, a fiber widely studied as a reinforcement in metal matrix and ceramic matrix composites, was characterized by spatially resolved Raman spectroscopy. Cross sections of as-received fibers and fibers annealed at 1640 °C were characterized in the backscattering geometry with the 514.5 nm line of an Ar+laser. Characteristic graphitic peaks were observed in the several regions of the SCS-6 fiber, including the inner SiC region. The SiC transverse optical phonon mode was observed in the outer SiC region as a double peak, suggesting the presence of multiple polytypes in this region. Spectra of the outer SiC layer of this fiber in the zircon-matrix composite also showed a distinct Si peak. Silicon in this fiber is believed to be responsible for the observed anomalous thermal expansion behavior of the fiber between 1300 and 1400 °C. ©1997 American Institute of Physics.
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