MIXTURE FOR PRECOAT OF SILVER-CONTAINING BIMETALLIC ELECTRIC CONTACT BASED ON COPPER POWDER Russian patent published in 1995 - IPC

FIELD: powder metallurgy. SUBSTANCE: mixture for precoat of silver-containing bimetallic electric contact based on copper powder contains nickel powder and additional powder of anhydrous nickel acetate with the following amount of components, mas.%: nickel powder 9-22; anhydrous nickel acetate 3-9; the balance, copper. Anhydrous nickel acetate reacts in technological process as binding agent to increase flow of mixture due to granulation. Mixture flow is 5.5-7 g/s and resistance to shear in precoat-working layer zone is 12,1-14,3 kg/mm².. EFFECT: improved technological properties and adhesion strength of precoat with working layer of contact. 1 tbl