Interfacial reaction and interfacial shear strength between CVD-SiC fiber and aluminum

CVD-SiC fibers of SCS-6 and SCS-2 were dipped into liquid pure aluminum for a certain time at dipping fiber length of 1 or 3mm. The melt was solidified, leaving dipped fiber as it was, and the interfacial shear strength was measured by pull out method. The mean interfacial shear strength was determined as 63MPa for SCS-6 fiber having 3μm carbon rich layer on the surface, though it could not be measured for the dipping length of 3mm due to the increase in interfacial area. For SCS-2 fiber having 1μm carbon rich layer the interfacial shear strength could not be measured for the dipping length of both 1 and 3mm, because of fiber degradation by SiC baring and its reaction with melt following disappearance of carbon coating layer. Critical fiber length for reinforcing of composite was estimated from the measured interfacial shear strength.