J Vicens et al. Aerospace Science and Technology 7(2003)135-146 Si Matrix d|兽 1入 Fig 4. EDX spectra taken: (a) at the fibre surface(at 100 nm from the CL/TL interface);(b)in the dark sublayer, (c)in the carbon interface; (d) at the carbon natrix interface(CL-Mg2Al4Sis O18);(e)in Mg2Al4Sis O18 300 2900 10 00 00-300-200-100 0 300400500600700 fibre interphase spodumene SiOz Fig. 5. Concentration profile taken through a SiC Nicalon/spodumene interface in a SiC Nicalon/MLAS composite fabricated by tape-casting matrix elements, except for yttrium in SiC Nicalon/YMAs using a combination of several analytical techniques(AES which does not diffuse into the fibre. Recently a silicon EELS, XPS)[22, 25, 26, 35]. The evolutions of the sublayers oxycarbide phase resulting from SiC oxidation has been with the temperature and duration of processing have also claimed to be formed in the transition layers observed in Sic been studied in SiC Nicalon/Pyrex composites Nicalon/LAS [22, 351, SiC Nicalon Duran [17, 18] and SiC In conclusion, in glass or glass ceramic composites Nicalon Pyrex composites [25, 26]. This has been shown by thin layer of carbon often textured acts as a mechanical140 J. Vicens et al. / Aerospace Science and Technology 7 (2003) 135–146 Fig. 4. EDX spectra taken: (a) at the fibre surface (at 100 nm from the CL/TL interface); (b) in the dark sublayer; (c) in the carbon interface; (d) at the carbon matrix interface (CL–Mg2Al4Si5O18); (e) in Mg2Al4Si5O18. Fig. 5. Concentration profile taken through a SiC Nicalon/spodumene interface in a SiC Nicalon/MLAS composite fabricated by tape-casting. matrix elements, except for yttrium in SiC Nicalon/YMAS which does not diffuse into the fibre. Recently a silicon oxycarbide phase resulting from SiC oxidation has been claimed to be formed in the transition layers observed in SiC Nicalon/LAS [22,35], SiC Nicalon Duran [17,18] and SiC Nicalon Pyrex composites [25,26]. This has been shown by using a combination of several analytical techniques (AES, EELS, XPS) [22,25,26,35]. The evolutions of the sublayers with the temperature and duration of processing have also been studied in SiC Nicalon/Pyrex composites. In conclusion, in glass or glass ceramic composites the thin layer of carbon often textured acts as a mechanical