METHOD FOR MANUFACTURING A COPPER-BASED BILAYER POWDER STRIP FOR HIGH-CURRENT INTERRUPTING ELECTRICAL CONTACTS Russian patent published in 2022 - IPC B22F3/16 H01H1/25 

FIELD: powder metallurgy.

SUBSTANCE: invention relates to the field of powder metallurgy, to the production of a bilayer powder strip based on copper, for the manufacture of high-current interrupting contacts. The initial charge is treated with pressure with the formation of a semi-finished product at the initial stage, which is heated and subjected to sealing deformation at the final stage. The initial charge contains a powder mixture containing activated carbon, Fe-Cu pseudo-alloy nano-powder and copper powder for the production of the working layer and copper powder for the production of the base layer. The charge is fed into the mouth of the rolls from a hopper divided by a gate into two parts, one of which is fed the powder mixture for the production of the working layer, the other, copper powder for the production of the base layer. The charge is rolled at a pressure of 400-450 MPa, the semi-finished product is heated to a temperature of 720-750°C in a hydrogen atmosphere, maintained and cooled. At the final stage, rolling is carried out in rolls with box-type calibers to a relative density of 0.95-0.98, at a pressure of 600-650 MPa, heating is carried out in a furnace to a temperature of 872-925°C in a hydrogen atmosphere, followed by exposure and cooling.

EFFECT: strip with high electrical and thermal conductivity, increased mechanical properties, softening temperature, welding resistance and high erosion resistance is provided.

1 cl, 1 dwg, 1 tbl, 1 ex