METHOD OF PRODUCING COMPOSITE MATERIAL FOR COPPER-BASED ELECTRIC CONTACTS Russian patent published in 2010 - IPC B22F3/14 C22C1/05 H01H1/25 

FIELD: process engineering.

SUBSTANCE: invention relates to powder metallurgy, particularly to method of producing copper-based composite materials. It can be used for production of electric contacts. Powders of graphite, copper, aluminium, phosphor copper and copper oxide are mixed at the following ratio, wt % graphite 0.10-0.20; aluminium 0.20-0.30; phosphor copper 0.05-0.15; copper oxide 1.15-1.4; copper making the rest. Prepared mix is subjected to high-power treatment in ball mill to produce granules of material representing copper-based matrix with reinforcing particles uniformly distributed therein in amount of 0.35 to 0.55 wt % of total weight with average size of 0.1 to 0.5 mm. Material matrix represents α-Cu(Al) substitutional solution while reinforcing particles - γ-Al₂O₃ with average size of 20-40 nm. Mix is compacted by extruding in heated state.

EFFECT: high electric arc wear, temperature of loss of strength and electric conductivity.

1 dwg, 2 tbl