EVALUATION OF INTERFACIAL SHEAR-STRENGTH OF C C COMPOSITES BY MEANS OF MICRO-INDENTATION TEST/

Micro indentation test technique was applied to evaluate interfacial s hear strength of uni-directional C/C composites, and the effectiveness of this method was discussed. Interfacial sliding was detected in the load - displacement of indenter curve (indentation curve), and push-i n and/or push-out fibers were observed. From the load displacement inf ormation of the micro indentation test, interfacial shear strength in C/C composites was defined At lower Heat treatment temperature (HTT) t han 2000K, almost no temperature dependence can be recognized. At high er HTT, however, interfacial shear strength was increased with increas ing HTT, which was supposed to be effected by the growth of graphite l ayer and increment residual compressive stress to fiber.