
plating, anodizing, & finishing Q&As since 1989
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Need a thin insulative coating for micro stainless steel housing
Q. My company builds a silicon chip device that is inserted into a very small metal tube housing. The OD is 0.015" and the ID is only 0.012". The problem I face is that the silicon circuit is leaking current into the housing. Since this is a implanted medical device, this is not acceptable.
I need to find a coating that will prevent this current flow. It should insulate both the inside and outside of the housing. The magnitude of the current is in the order of 2 milliamps.
Because my clearance from IC to housing is only 0.001" the coating must be very thin.
medical devices - London ,Ontario, Canada
2005
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2005 A. A PVD coating might work. It depends on the aspect ratio of the hole. PVD coatings can go down holes, but not very far, maybe twice the diameter or so. ![]() Jim Treglio - scwineryreview.com PVD Consultant & Wine Lover - San Diego, California 2005 A. Your gap is really very small. If there is such a coating it will probably be a lacquer or enamel. Problem is to assure it remains impervious and dielectric after insertion due to possible damage. Monterrey, NL, Mexico |
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