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Raman analysis of materials corrosion: the example of SiC fibers
Author(s) -
Colomban Ph.,
Gouadec G.,
Mazerolles L.
Publication year - 2002
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/1521-4176(200205)53:5<306::aid-maco306>3.0.co;2-w
Subject(s) - raman spectroscopy , corrosion , materials science , chemistry , composite material , physics , optics
Advanced materials (ceramics, fibers, composites...) exhibit unique high temperature properties but long term durability assessment is mandatory on account of high processing costs. We used Raman micro‐spectroscopy to analyze the corrosion resistance of commercially available SiC fibers versus Na + ions, with or without fiber thermal treatment (in air or in a reducing atmosphere) prior to sodium attack. The lateral resolution of the technique approaches the submicron scale and the analysis of colored materials can be limited to a few tens of nanometers in‐depth, which makes Raman micro‐spectrometry well suited for the analysis of corrosion films. Although corrosion starts with localized defects in pristine Nicalon TM fibers attacked with Na + (in oxidizing conditions), a protective effect of a silica film is clear for oxidized fibers. The corrosion of SiC crystals seems to be related to stacking faults.