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topic 32356

Compatibility of NiZn plating and Ag plating as an electrical contact



One of the lines of products my company makes is PTC heaters. We have an application we're developing where a PTC is placed directly against a metal housing to bring it up to a certain base temperature. The PTC as proposed is a ceramic substrate coated with a thick-film silver. It's a rather porous surface, but provides good ohmic contact with the PTC substrate. The housing it contacts is mild steel coated with a NiZn plating. This interface is conductive as it provides one of the electrodes of the PTC and will be flowing current continuously. I have two questions. First, will these two plated surfaces react well together as a circuit connection? The atmosphere is a standard industrial setting, so temps from -40 to +85°C and humidity from 0% to 100%, possibly condensing. The second question is, is there any suitable adhesive which could bind these two surfaces together and still maintain good thermal and electrical contact?

Thanks for your help.

Tim Coste
First Technology - Standish, Maine, USA

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