Three-stage channel sprays carbon nanotubes onto carbon fibers surface, preparing high performance carbon fibers composites

Carbon fibers composites performance strengthening through graft Carbon nanotubes is a research hotspot at present. Here, a method for rapidly and effectively dispersing and removing CNT aggregates during spraying the CNTs onto CFs surface by the three-stage channel is reported. The scanning electron microscopy image characterization results shows that the three-stage channel has a significant effect on the removal of CNTs aggregates, and the obtained p-CNTs has a good dispersion morphology. Under the same condition, p-CNTs@CFs/EP and CNTs@CFs/EP composites are prepared by the three-stage channel spraying and direct spraying method respectively. Compared with no treatment CFs composites (o@CFs/EP), the tensile, compressive and interlaminar shear strength and radial thermal conductivity (λ ⊥ ) of the CNTs@CFs/EP are increased by 7%, 11%, 9% and 80% (2452.04 MPa, 1209.37 MPa, 89.30 MPa and 1.28 W/(m·K)), the p-CNTs@CFs/EP increased by 29%, 35%, 37% and 203% (2949.06 MPa, 1471.67 MPa, 112.37 MPa and 2.15 W/(m·K)), the CNTs@CFs/EP resistivity is 72.72 Ω·m, a 64% decrease, the p-CNTs@CFs/EP is 45.45 Ω·m, a decrease of 78%. This indicates that the CFs composites prepared by the three-stage channel spraying method has better performance than direct spraying and no treatment. This method provides a new idea for CFs composites performance strengthening.