Raman spectroscopy of bio-SiC ceramics

✍ Scribed by Yukhymchuk, V. O. ;Kiselov, V. S. ;Belyaev, A. E. ;Valakh, M. Ya. ;Chursanova, M. V. ;Danailov, M. ;Vitusevich, S. A.

• Book ID: 105366303
• Publisher: John Wiley and Sons
• Year: 2011
• Tongue: English
• Weight: 510 KB
• Volume: 208
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/pssa.201026618

✦ Synopsis

Abstract

Biomorphic SiC ceramics produced by the forced infiltration with liquid silicon of carbon matrices derived from hardwood precursors were investigated. The phase composition of the ceramics obtained was found to be dependent on the mass ratio of the initial silicon and carbon components, the synthesis temperature, and the process duration. Raman spectroscopy (RS) investigations showed that the 3C polytype is formed at a synthesis temperature of about 1550 °C, and that both 3C and 6H‐SiC are formed at temperatures of about 1800 °C. Further temperature rises up to 2100 °C lead to an increase in the fraction of the 6H polytype. In the specimens obtained by impregnation under excess Si conditions, the residual silicon inside the SiC pores is recorded. Analysis of the parameters of phonon peaks allowed us to conclude that the residual silicon in these samples is under significant compressive strain.magnified image

Surface morphology of axial profiles of SiC ceramics produced from pear‐tree wood for ψ = 2.33 component mass ratio.