COMPOSITE ELECTRIC CONTACT AND METHOD OF ITS FABRICATION Russian patent published in 2010 - IPC H01H1/00 H01H11/04 

FIELD: electrical engineering.

SUBSTANCE: proposed contact is made from graphite-based material containing metal additives. Note here that graphite base is made from fine-grained busy graphite with specific resistance of not over 16 mcmOhm*m, compression strength making at least 60 MPa, ash content not exceeding 0.3% and bulk porosity of 15-25%. Metal additive is distributed in graphite pores in amount making at least 10% of pore volume, while metal additive particles form discontinuous 10 mcm-thick surface coat on graphite base surface. Proposed method involves mechanical dimensional processing of contact made from structural graphite, impregnating said contact with ethanol and holding it in water solution of silver nitrate of density varying from 1.4 to 1.17 g/cm³ at temperature 10-40°C higher than boiling temperature of impregnation liquid during 10-15 min. Then contact is subjected to thermal treatment at below 0.95 of silver melting temperature for 0.5-1.0 h, said contact being placed in container and backfilled by char coal.

EFFECT: lower production costs.

2 cl, 1 tbl