RADAR-ABSORBING MATERIAL (OPTIONS) Russian patent published in 2021 - IPC H01Q17/00 

FIELD: radio-absorbing materials.

SUBSTANCE: invention relates to radio-absorbing materials (RAM), effective in the frequency range from 6 to 40 GHz, and can be used in those areas of technology where lightweight non-combustible radioprotective materials are required that are resistant to prolonged exposure to high temperatures. Two versions of RAM are proposed: RAM containing a dielectric binder polyalumochromophosphate and an electromagnetic radiation absorbing filler including hollow glass microspheres, soot and dispersed carbon fiber, with the following ratio of components, wt.%: polyalumochromophosphate - 54.5-58.0; hollow glass microspheres - 27-39; soot - 6-12; dispersed carbon fiber - 0-3, obtained by mixing the filler with an aqueous solution of alumochromophosphate at a mass ratio of alumochromophosphate/water = 1:2-2.2, followed by curing; RAM containing a dielectric binder - a product of the interaction of aluminoborophosphate and sodium tetraborate, and an electromagnetic radiation absorbing filler, including hollow glass microspheres, soot and dispersed carbon fiber, with the following ratio of components, wt.%: polyaluminium borophosphate - 42-49; sodium tetraborate - 12-2 0; hollow glass microspheres - 23.9-38.4; soot - 6-10; dispersed carbon fiber - 0-3, obtained by mixing a filler and sodium tetraborate with an aqueous solution of aluminoborophosphate at a mass ratio of aluminoborophosphate/water = 1: 2-2.2, followed by curing.

EFFECT: creation of a RAM (options) characterized by fire resistance (flammability class NF), high thermal resistance and low density (no more than 0.2 g/cm³), as well as environmentally friendly, absorbing electromagnetic radiation in a wide range of microwave waves.

4 cl, 1 dwg, 1 tbl