POROUS CASINGS PRODUCTION METHOD Russian patent published in 1995 - IPC

FIELD: foundry. SUBSTANCE: casting mold, filled with compacted and heated filler, is subjected to vacuum pumping out and then liquid metal is fed in it under pressure, that is defined according to formula 2-3·10^-7 σ_l.mcosθ_b.ar, MPa with σ_l.m - surface stress of liquid metal, mN/m; θ_b.a - balancing angle of filler surface wetting by liquid metal, deg.; r - minimum radius of pores in filler, m. Method allows to produce castings with porous difference of less than 2 % from alloys, based on copper, silver, aluminum, zinc, lead and cadmium. EFFECT: porous castings production method is used in foundry. 1 tbl