Experimental investigation on mechanical properties of hybrid carbon-carbon composites at ultra-high temperature

Applying the fast electric heating technique, the ultra-high temperature condition of hybrid carbon-carbon composites in practice is simulated. Then their tensile and compressive mechanical properties are measured, both the strength and the modulus in the longitudinal and transverse directions of composites are obtained, and simple regressive polynomial fit curves are given also. Results show that both the strength and the modulus increase with the increase of temperature in a certain range, and get the peak at 2000 K - 2400 K, and drop quickly after 2700 K. Furthermore, the tensile and compressive properties change more slowly in the longitudinal direction than in the transverse direction, and also the strength changes in a narrower range than the modulus.