Method of producing composite material for copper-based electric contacts. RU patent 2398656.

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

IPC classes for russian patent Method of producing composite material for copper-based electric contacts. RU patent 2398656. (RU 2398656):

H01H1/025 - Electric switches

C22C1/05 - ALLOYS (treatment of alloys C21D, C22F)

B22F3/14 - simultaneously

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