HORIBA Worldwide

Wavenumber distribution of the D (sp^2-3) band of the carbon second phase in a SiC fibre cross-section (fibre diameter ~12 µm) showing the fibre composition and firing degree gradient.

Carbon nanograin size (in nm) can be calculated using the correlation between the coherent length and the Raman peaks ratio I^D/I^G.

The availability of a relationship correlating Raman studies, TEM examination and the ultimate strength measurements is used to predict the relative mechanical strength in the different fibre regions, without the need to destroy the SiC fibre reinforced Ceramic Matrix Composite. This is very useful for the optimization of the manufacturing process.

References
Ph. COLOMBAN
Raman analyses and "smart" imaging of nanophases and nanosized materials
Spectroscopy Europe 15 [6] (2003) 8-15
http://www.spectroscopyeurope.com
http://www.spectroscopyeurope.com/Raman_15_6.pdf

M. HAVEL, D. BARON, Ph. COLOMBAN
Smart Raman/Rayleigh Imaging of Nanosized SiC Materials Using the Spatial Correlation Model
J. Mater. Sci. 39 [20] (2004) 6183-90.

M. HAVEL, Ph. COLOMBAN
Raman and Rayleigh Mapping of Corrosion and Micromechanical Aging in SiC Fibres
Comp. Sci. & Techn. 65 [3-4] (2005) 353-358.

Contact
Dr Philippe COLOMBAN for further information on +33 (0)149781105
E-mail: colomban@glvt-cnrs.fr