Multilayer radar-absorbing laminate for aircraft made of polymer matrix composite material with graphene nanoplatelets, and method of manufacturing same
US11597192B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 1, 2019 |
| Grant date | Mar 7, 2023 |
| Priority date | — |
| Expiry date | Jan 7, 2040 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2363/00
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.