Abstract: An electrically conductive composite powder having improved corrosion resistance is provided for microwave shielding applications. The electrically conductive composite powder composition includes a core of particles having a low density and a high dielectric constant; a nickel layer that is coated onto the core of particles; and a corrosion resistant alloy layer that is deposited onto the nickel layer. The electrically conductive composite powder exhibits excellent corrosion resistance performance, while also being substantially lower in cost that conventional Ag/glass shields. The electrically conductive composite powder can be used across a broad frequency range.

Abstract: An electrically conductive composite powder is provided for microwave shielding applications. The electrically conductive composite powder includes a core of particles formed from a material having a low density of <5 g/cm3 and a high dielectric constant of ?10; an intermediate layer coated onto the core of particles, wherein said intermediate layer has a high electrical conductivity of >5.90×10?8 Ohm*m at 20° C.; and an outer layer that is deposited onto the intermediate layer, said outer layer comprising a material having a high oxidation and corrosion resistance of >?0.2V galvanic potential in seawater as measured via ASTM G82. The electrically conductive composite powder exhibits excellent microwave shielding performance, while also being substantially lower in cost that conventional Ag/Ni shields. The electrically conductive composite powder can be used across a broad microwave frequency range.