Experimental investigation on compressive properties of 2D C/C composites at ultra-high temperature

Based on good conductive performances of 2D C/C composites, their compressive properties from room temperature to 2 400℃ were studied by using direct electric heating technology to specimens. The test method of mechanical properties of C/C composites at ultra-high temperature was developed, and the damage morphology and changing laws of their in-plane compressive strength and modulus with respect to temperature were obtained. The results indicate that 2D C/C composites exhibit the performance of linear elastic and brittle failure in a certain temperature range, besides, both strength and modulus increase with the temperature. Strength rises dramatically, which reaches the peak at 2 400℃. On the other hand, the performance of inter-laminar interface between fiber and matrix plays an important role in 2D C/C composites, and its change will influence both their mechanical properties and fracture modes directly.