Performance Comparison and Mechanism Analysis of Several No-Bake Sand

Abstract

Performance and mechanism of furan resin no-bake sand, ester-sodium silicate sand, CO2-sodium silicate sand and phosphate no-bake sand were compared by test and analyzed by SEM. Results indicate that furan resin sand and ester-sodium silicate sand have higher dry strength and better humidity resistance, because their fracture modes are cohesive fracture and plastic fracture, there is less crack on their bond membrane. Fracture modes of phosphate sand and CO2-sodium silicate sand are cohesive fracture mainly with a few adhesive fracture and brittle fracture, there is more crack on their bond membrane, which is benefit for moisture to invade, so their compressive strength after hardening and moisture absorption are lower, but phosphate sand has higher dry strength and better humidity resistance than CO2-sodium silicate sand, lower cost and less pollution than furan resin sand, the lowest gas evolution and the best collapsibility , it has a wide application prospect.