The interfacial behaviour of a SiC fibre/CaO–MgO–Al2O3–SiO2 glass ceramic matrix composite has been assessed by examining the shear properties of the interface. The room temperature (RT) frictional stress was measured after 12–164 h exposure in air at temperatures in the range 700–900°C. Compared with the as fabricated condition, the results reveal that the RT frictional stress increased after heat treatment at these temperatures and after long holding times at temperature. The thermodynamics of SiC fibres heat treated in air over the same range of temperatures and times is discussed.
MST/1341
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