Abstract
The fibre-matrix reaction that occurs during the processing of a Nicalon SiC fibre-Pyrex glass matrix composite is analysed. Interphases are characterized by means of various complementary techniques: electron diffraction, HRTEM, EDX, EELS, SIMS and XPS. Neither the results of the present study nor those previously obtained for Nicalon SiC fibre-LAS (Li2O-Al2O3-SiO2) glass or LAS + MAS (MgO-Al2O3-SiO2) glass-ceramic matrix composites support the available model of reaction. An alternative reaction mechanism is suggested whereby the dissolved and non-bridging oxygen atoms of the matrix diffuse and oxidize SiC and SiOxCy in the fibre. The reaction yields carbon and silicon oxycarbide in the fibre and SiO2 which dissolves into the matrix. When the oxygen in excess in the matrix is consumed, the reaction stops and the phases undergo a reorganization in the reaction layer which generates two interphases, one carbon rich and the other silicon oxycarbide rich. These interphases are observed at the fibre peripher...
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