Methods of Obtaining an Electrical Contact.

摘要

There is a known method for obtaining an electrical contact between connectable parts by hardening a polymer film with ferromagnetic filler in an electrical field. If the film is hardened in a uniform magnetic field, the induced chains are isolated from each other only with very low doses of filler, less than 2% by volume. The chains in such a low-filled film are very thin and the specific resistance rho approx. 0.15 does not ensure a sufficiently reliable electrical contact. In order to obtain smaller values of rho it is necessary to increase the dosing of the filler. In this case the number of chains per unit of film area increases, the distance between the chains diminishes, and for dosings over 2% by volume, connectors are formed between the chains that close them among themselves, thus raising the electrical conductivity along the film. No reliable multispot electrical contact is thus obtained in the uniform field.