Communications: directive radio wave systems and devices (e.g. – Radar reflector – Chaff
Patent
1989-12-11
1991-08-13
Dean, R.
Communications: directive radio wave systems and devices (e.g.,
Radar reflector
Chaff
428601, 428621, 428671, 428676, 204DIG6, H01Q 1500
Patent
active
050399900
ABSTRACT:
An article comprising a non-conductive substrate having a sub-micron thickness of an oxidizable conductive first metal coating thereon, and a second (promoter) metal which is galvanically effective to promote the corrosion of the first metal, discontinuously coated on the first metal coating. Optionally, the second metal-doped, first metal-coated substrate may be further coated with a salt, to accelerate the galvanic corrosion reaction by which the conductive first metal coating is oxidized. Also disclosed is a related method of forming such articles, comprising chemical vapor depositing the first metal on the substrate and chemical vapor depositing the second metal on the applied first metal coating, and of optionally applying a salt by salt solution contacting of the second metal-doped, first metal-coated substrate. When utilized in a form comprising fine-diameter substrate elements such as glass or ceramic filaments, the resulting product may be usefully employed as an evanescent chaff. In the presence of atmosphere moisture, such evanescent chaff undergoes oxidation of the first metal coating so that the radar signature of the chaff transiently decays.
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Cummings Delwyn F.
Stevens Ward C.
Sturm Edward A.
Advanced Technology & Materials Inc.
Dean R.
Hultquist Steven J.
Wyszomierski George
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