Radar emissions absorbing material
Radar emission absorbing materials that are moldable or that may be coated on a surface are described. A moldable radar emission absorbing material may include commuted carbon foam particles blended with a moldable matrix. In other embodiments, a radar emission absorbing surface coating material may include comminuted carbon foam particles blended with a solvent-solid system.
1. A moldable radar absorbing material comprising:
a comminuted carbon foam blended with a moldable matrix, wherein the moldable radar absorbing material has an electrical resistivity of about 1.E +00 ohm-cm to about 1.E +06 ohm-cm, and wherein said comminuted carbon foam has an electrical resistivity in the range of about 1 E +00 ohm-cm to about 1 E +06 ohm-cm.
2. The moldable radar absorbing material of claim 1 , wherein said moldable matrix is selected from the group consisting of thermosetting polymers, thermoplastic polymers, clays, elastomers, putties, cements, and epoxy adhesives.
3. The moldable radar absorbing material of claim 1 , wherein said comminuted carbon foam has a dielectric constant in the range of about 2 to about 6.
4. The moldable radar absorbing material of claim 1 , wherein said carbon foam is derived from a carbon material selected from the group consisting of coal, coal tar pitch, coal derivatives, petroleum pitch, synthetic pitch, and carbon foams produced by the carbonization of polyacrylonitrile.
5. A radar absorbing surface coating material comprising:
a comminuted carbon foam blended with a solvent-solid system, wherein the radar absorbing surface coating material has of about 1.E +00 olin-i-cm to about 1.E +06 ohm-cm, and wherein said comminuted carbon foam has an electrical resistivity in the range of about 1 E +00 ohm-cm to about 1 E +06 ohm-cm.
6. The radar absorbing surface coating material of claim 5 , wherein said solvent-solid system is selected from the group consisting of paints, solvent glues, and solvent dissolved resins.
7. The radar absorbing surface coating material of claim 5 , wherein said comminuted carbon foam has a dielectric constant in the range of about 2 to about 6.
8. The radar absorbing surface coating material of claim 5 , wherein said carbon foam is derived from a carbon material selected from the group consisting of coal, coal tar pitch, coal derivatives, petroleum pitch, synthetic pitch, and carbon foams produced by the carbonization of polyacrylonitrile.