Procedures for the manufacture of radar absorbent structural components for aeroplanes in composite material with insertion of graphene nanoplates.

摘要

The laminate consists of three juxtaposed blocks, with - a first electrically conductive block (15) to be arranged toward the inside of the aircraft in use. - a second electromagnetic intermediate absorber block (11), comprising a layer of electrically non-conductive fiber sheets (13), where each fiber sheet is permeated by graphene-based nanoplatelets (12), so as to achieve a periodic and electromagnetically subresonant layer wherein conductive layers containing graphene nanoplatelets alternate with non-conductive layers, and - a third block (14) of electrically non-conductive material to be arranged towards the outside in use and forming part of the outer surface of the aircraft. The second block (11) is produced by depositing on one or both sides of the fiber sheets a suspension of graphene nanoplatelets in a polymeric mixture, with controlled penetration of the nanoplatelets into the respective fiber sheets. Then a plurality of dry fiber sheets sprayed with the suspension of graphene nanoplatelets is superimposed. Thus, a lay-up of the first, second and third block is made, and unpolymerized thermosetting synthetic resin is infused into the lay-up thus obtained. Finally, the thermosetting resin is polymerized.