Surface coating for insulative materials, method of obtaining it and its application to shielding insulative cases
AssigneeTecmachine
InventorsChristophe Heau, Paul Berger
Life of this patent
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Abstract
A surface coating on an insulative material substrate, assuring protection against electromagnetic interference in corrosive environments, comprises two stacked metallic layers. The first layer, in contact with the substrate, is a layer of nickel-based alloy containing about 2% to 20% by weight of an element from group V B from the Periodic Table of the Elements. The second, surface layer is a layer of silver or one or its alloys. Applications include insulative material cases for electrical or electronic components including a shield consisting of a surface coating of this kind.
Claims17
A surface coating on an insulative material substrate, adapted to a protection against electromagnetic interference in corrosive environments, comprising two stacked metal layers, the first, in contact with said substrate, being a layer of nickel-based alloy containing about 80% to 98% by weight of nickel, and between about 2% and 20% by weight of at least one metal from group V B of the Periodic Table of the Elements, the second, surface layer being a layer based on metallic silver or one of its alloys.
A surface coating on an insulative material substrate, adapted to assure protection against electromagnetic interference in corrosive environments, comprising two stacked metal layers, the first, in contact with said substrate, being a layer of nickel-based alloy containing 80% to 98% by weight of nickel, said nickel based alloy containing between about 2% and 20% by weight of at least one metal from group V B of the Periodic Table of the Elements the second, surface layer being a layer based on metallic silver or one of its alloys, the surface resistivity of said surface coating capable of remaining stable when said surface coating is subjected for 48 hours to an accelerated corrosion test, carried out in accordance with French standard NF C 20-711.
Dependencies are inferred from the claim text.