SAND MOLD, METHOD OF MAKING SAND MOLD AND CORE FOR CASTING METAL Russian patent published in 2017 - IPC B22C1/02 B22C1/12 B22C9/02 B22C9/10 B22D21/04 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, specifically to foamed sand mixture used for making casting sand cores and foundry sand molds of aluminium or aluminium alloys. Mixture contains sand, water-soluble binding material, particles of inorganic compounds and foam formed by mixing said components with water. Particles of inorganic compounds can be separated when heating by fused metal at least one of water vapour or gaseous carbon dioxide. Solubility of particles of inorganic compounds in water is 100 mg or less in 1 l of water at 25 °C, and viscosity of mixture ranges from 0.5 to 10 Pa⋅s.

EFFECT: use of foamed sand mixture simplifies removal of molds and cores from surface of cast article.

23 cl, 4 dwg, 3 tbl, 7 ex