公开(公告)号：US11597192B2

公开(公告)日：2023-03-07

申请号：US16976988

申请日：2019-03-01

申请人： LEONARDO S.P.A.

发明人： Luigi Pisu ,  Gianni Iagulli ,  Maria Sabrina Sarto ,  Fabrizio Marra ,  Julian Lecini ,  Alessio Tamburrano

IPC分类号： B32B27/12 ,  B29C70/02 ,  B29C70/88 ,  B32B17/04 ,  C08J5/24 ,  B82Y30/00 ,  B82Y40/00

摘要： A multilayer radar-absorbing laminate includes three juxtaposed blocks.
A first electrically conductive block is arranged toward the inside of the aircraft in use.
A second electromagnetic intermediate absorber block has a layer of electrically non-conductive fiber sheets is permeated by graphene-based nanoplatelets to achieve a periodic and electromagnetically subresonant layer, the conductive layers containing graphene nanoplatelets alternating with non-conductive layers.
A third block of electrically non-conductive material is arranged towards the outside and forms part of the outer surface of the aircraft. The second block is produced by depositing on the fiber sheets a suspension of graphene nanoplatelets in a polymeric mixture, with controlled penetration of the graphene nanoplatelets into the fiber sheets. A plurality of dry fiber sheets sprayed with the suspension of graphene nanoplatelets is superimposed. An unpolymerized thermosetting synthetic resin is infused into a lay-up made of the first, second and third blocks. Afterwards, the thermosetting resin is polymerized.