Effects of porosity on mechanical capability of carbon composites reinforced by chopped high modulus carbonfiber

Effects of porosity on the material performance of chopped high modulus carbon fiber reinforced carbon composites and carbon materials were studied. The results show that the flexural strength and hardness of chopped high modulus carbon fiber reinforced carbon composites are better than carbon material and the flexural strength and hardness of the two materials are in inverse proportion to porosity. The porosity affects the compressive strength of chopped high modulus carbon fiber reinforced carbon composites greatly but not greatly on carbon material. The surface of fracture is observed with SEM, and the result shows that chopped high modulus carbon fiber randomly orient and uniformly disperse in the carbon matrix.