CONDUCTIVE SURFACING FILMS FOR LIGHTNING STRIKE AND ELECTROMAGNETIC INTERFERENCE SHIELDING OF THERMOSET COMPOSITE MATERIALS

摘要

Embodiments of thepresent disclosure present electricallyconductive, thermosetting compositionsfor use in surfacing films and adhesives.The surfacing films possess enhancedelectrical conductivity, comparable tometals, without the use of embeddedmetal screens or foils. Such surfacingfilms may be incorporated into compositestructures (e.g., prepregs, tapes, and fabrics),for example, by co-curing, as anoutermost surface layer. In particular,compositions formed using silver flakesas conductive fillers are found to exhibitvery high electrical conductivity. For example,compositions including greaterthan 45 wt. % silver flake exhibit resistivitiesless than about 55 m.OMEGA./sq. In thismanner, the surfacing films as an outermostconductive layer may provide lightingstrike protection (LSP) and electromagneticinterference (EMI) shieldingwhen used in applications such as aircraftcomponents.