Influence of Modern Inorganic Binders GEOPOL® on Green Sand Mixtures

In collaboration with SAND TEAM, KERAMOST and the Italian foundry F.A. Spa through F.A. Engineering Srl partner of the Green Casting LIFE project, the effect of the proportion of sand from inorganic cores on the properties of green sand mixtures was investigated. The loss of tensile strength in the condensation zone was chosen as a criterion. It is usually stated that a decrease of 20% compared to the values without the addition of the studied mixture component is critical. The compressive strength and abrasion of the green sand mixtures was also attempted to be evaluated. Core mixtures with the following binders were chosen as the likely source of sand from the cores for the green sand mixtures: GEOPOL® CO2 for carbon dioxide hardening and GEOPOL® W for hardening with the heat of the core box and blowing with hot air. It was found that GEOPOL® W had significantly less harmful effects on the properties of green sand mixture. A critical loss of strength in the condensation zone occurs only at a content of 70% of the sand from these cores and 45% in the case of the F.A. Spa green sand mixture. The abrasion tests showed, only a minimal negative effect of the sand from the cores was detected.