MECHANICAL PROPERTIES OF CARBON-CARBON COMPOSITES REINFORCED WITH CARBON NANOTUBES OR CARBON NANOFIBERS

摘要

The mechanical properties of CNTs or CNFs reinforced phenolic resin matrix composites and carbon/carbon (C/C) composites were investigated. The C/C composites were obtained by pyrolyzing the phenolic resin composites. For the phenolic resin composites, limited strength enhancement was measured. However, better reinforcing results were obtained for CNF reinforcement as compared to the CNT reinforcement due to the better interfacial bonding. CNF reinforcement also showed better results for the modulus measurement than those of CNTs. Contrary to the phenolic resin composites, CNTs showed better reinforcing results for C/C composites carbonized at 1000 and 1400°C. For C/C composites heat treated at 2400°C, the flexural strength values were lower than those at 1000 and 1400°C, and the difference between different reinforcements was not significant. Compared with the flexural strength, the enhancement of flexural modulus was much more significant.