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In-situ growing carbon nanotubes(CNTs)directly on carbon?bers(CFs)always lead to a degraded tensile strength of CFs and then a poor?ber-dominated mechanical property of carbon/carbon composites(C/Cs).To solve this issue,here,a novel carbon?ber-based multiscale reinforcement is reported.To synthesize it,carbon?bers(CFs)have been?rst grafted by graphene oxide(GO),and then carbon nanotubes(CNTs)have been in-situ grown on GO-grafted CFs by catalytic chemical vapor deposition.Characterizations on this novel reinforcement show that GO grafting cannot only nondestructively improve the surface chemical activity of CFs but also protect CFs against the high-temperature corrosion of metal catalyst during CNT growth,which maintains their tensile properties.Tensile property tests for unidirectional C/Cs with different preforms show that this novel reinforcement can endow C/C with improved tensile properties,32% and 87%higher than that of pure C/C and C/C only doped with in-situ grown CNTs.This work would open up a possibility to fabricate multiscale C/Cs with excellent global performance.
In-situ growing carbon nanotubes (CNTs) directly on carbon? Bers (CFs) always lead to a degraded tensile strength of CFs and then a poor? Ber-dominated mechanical property of carbon / carbon composites (C / Cs) .To solve this issue, here, a novel carbon? ber-based multiscale reinforcement is is reported.To synthesize it, carbon? bers (CFs) have been? rst grafted by graphene oxide (GO), and then carbon nanotubes (CNTs) have been in-situ grown on GO-grafted CFs by catalytic chemical vapor deposition. Characterizations on this novel reinforcement show that GO grafting can not only nondestructively improve the surface chemical activity of CFs but also protect CFs against the high-temperature corrosion of metal catalyst during CNT growth, which under Their tensile properties. Sensitive property tests for unidirectional C / Cs with different preforms show that this novel reinforcement can end end C / C with improved tensile properties, 32% and 87% higher than that of pure C / C and C / C only doped with in-situ grown CNTs.This work would open up a may to fabricate multiscale C / Cs with excellent global performance.