Abstract
Fully glass-coated samples of two-dimensionally layered SiC SiC composite, which had a thin carbon interfacial layer between the fibre and the matrix, were heat-treated in air for 50 h at temperatures of 1000, 1150, 1300 and 1400 °C. The mechanical properties of these heat-treated samples were assessed by means of wedge opening tests, and the microstructural changes due to different heat treatments were subsequently investigated. The glass coating prevented the environmental oxidation of the bulk material whose mechanical properties were retained after heating up to 1200 °C. Heating above 1200 °C drastically changed the mechanical properties of the composite. This property degradation is attributed to both the structural changes in the fibres and a greatly weakened fibre-matrix interphase. Heating uncoated SiC SiC specimens at 800 °C for 100 h resulted in oxidation of the composite up to a depth of 0.5 mm below the surface. This oxidized layer did not affect the mechanical properties of the bulk material when specimens for wedge opening tests were notched after the heat treatment. However, heat treatments at 860 and 1200 °C degraded the properties of the specimens which had been notched before the heat treatment. It is believed that such degradation in mechanical properties arises from the oxidation of the carbon interphase in the unprotected notch tip region.
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