PROCEDURE FOR FABRICATION OF HIGH STRENGTH AND WEAR RESISTANT ELECTRO-TECHNICAL ITEMS OF CHROMIUM OR CHROMIUM-ZINC BRONZE WITH NANO AND MICRO-CRYSTAL STRUCTURE Russian patent published in 2011 - IPC C22F1/08 B82B3/00 

FIELD: metallurgy.

SUBSTANCE: here is disclosed procedure for fabrication of high strength and wear resistant electro-technical items of chromium or chromium-zinc bronze with nano and sub-micro-crystal structure. According to the procedure source work pieces of bronze are subjected to multi-cycle equi-channel angular press forming at rate 0.4 mm/sec at room temperature and at total number of cycles facilitating reduction of average dimension of bronze grains to dimension of grain d_opt, value of which is preliminary determined depending on composition of bronze in accordance with expression: d_opt=4bG/(π(1-v)(σ-σ_i ^(b))), where b is Burgers vector, G is modulus of alloy shear, v is Poisson ratio, σ is external applied stress, σ_i ^(b) is internal stress from non-equilibrium borders of grains; further, the work pieces are annealed in air in one or two stages at temperature 75-450°C during from 5 min to 200 hours with successive formation of electro-technical items out of them.

EFFECT: raised processability of fabrication at increased wear resistance and combination of strength and electric conductivity of work-pieces.

3 cl, 2 dwg