J Vicens et al. Aerospace Science and Technology 7(2003)135-146 CL M nm Fig. 2. HRTEM micrograph of the carbon layer where turbostratic carbon can be seen at the contact zone with the fibre. ole of a co fibre interface in the SiC Nicalon/YMAS. Yttrium di- centration profile taken at the FM interface in a SiC silicate(Y2Si2O7), and cordierite(Mg2 Al4 Sis O18)are the Nicalon/MLAS composite fabricated by tape-casting [28]is main phases crystallized in the matrix. Spectra taken at given in Fig. 5. This concentration profile was taken pre- the fibre surface (at 100 nm from the CL/TL interface) cisely through a SiC Nicalon/spodumene interface where (Fig. 4a), in the dark sublayer(Fig. 4b), in the carbon both sublayers(TL and Cl)were clearly imaged as in Fig. I interphase(CL)(Fig. 4c), at the carbon/matrix interfaces for the Sic Nicalon/Y MAS composite. The first layer(TL) CL/Mg2 Al4 SisO18, )and in Mg2 Al4SisO18Fig 4d and 4e, 400 nm) is enriched in oxygen and displays some amount138 J. Vicens et al. / Aerospace Science and Technology 7 (2003) 135–146 Fig. 2. HRTEM micrograph of the carbon layer where turbostratic carbon can be seen at the contact zone with the fibre. interface in the following configurations: Mg2Al4Si5O18 fibre interface in the SiC Nicalon/YMAS. Yttrium di￾silicate (Y2Si2O7), and cordierite (Mg2Al4Si5O18) are the main phases crystallized in the matrix. Spectra taken at the fibre surface (at 100 nm from the CL/TL interface) (Fig. 4a), in the dark sublayer (Fig. 4b), in the carbon interphase (CL) (Fig. 4c), at the carbon/matrix interfaces (CL/Mg2Al4Si5O18, ) and in Mg2Al4Si5O18 (Fig. 4d and 4e, respectively) are displayed. Another example of a con￾centration profile taken at the FM interface in a SiC Nicalon/MLAS composite fabricated by tape-casting [28] is given in Fig. 5. This concentration profile was taken pre￾cisely through a SiC Nicalon/spodumene interface where both sublayers (TL and CL) were clearly imaged as in Fig. 1 for the SiC Nicalon/YMAS composite. The first layer (TL) (∼400 nm) is enriched in oxygen and displays some amount