Conductive adhesive. Tips for a beginner radio amateur

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Conductive adhesive. HAM Tips

HAM Tips

It is known that some metals are difficult to solder, and some do not solder at all. Therefore, in cases where soldering is not possible, and an electrical connection is necessary, it is necessary to use an adhesive electrically conductive mass. I want to talk about the composition and technology of manufacturing and using such a mass.

When repairing the electronic watch "Electronics-2", several terminals of the digital indicator IVL 1-7/5 had poor contact between the petals and the conductive paths on the glass. Of course, it is impossible to solder them, so there was only one way out - to glue them. The recipes for electrically conductive adhesives described in reference books use scarce components such as powdered silver and polymeric binders. Therefore, I had to develop my own mass recipe from the available components.

For its preparation, copper filings, graphite of the finest grinding and a binder, such as varnish or glue, are needed. Copper filings are easy to get with a small file from a piece of copper. If there is no graphite, you need to take an electric brush from any collector electric motor and cut the required amount of graphite powder with a knife. The binder should be as fluid as possible.

First, two parts (by weight) of copper powder and one part of graphite are mixed, then a binder is added to the desired consistency - and the mass is ready. As a binder, I tried using cedar varnish for artwork. It is very liquid and, when dried, does not isolate the conductive particles from one another. You can apply another oil varnish or glue, after diluting it with a solvent.

Before using a conductive mass on a repaired product, you should first test the strength of the adhesive seam and its conductivity on a sample. If varnish is chosen as a binder, the strength of the seam, of course, will not be very high.

Author: Yu. Shishkin

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