Abstract

Poor performance of local binder of foundry core in casting has been a major concern recently. The effect of some local binder on the mechanical properties of a core has been studied in an attempt to develop a suitable core strength using green compression strength, baked compression strength, permeability and collapsibility test. The effect of temperature, water content, baking time, binder quantity and sand fineness on the core behavior strength was observed. The compression strength of baked cores increased with an increase in the quantity of binder added. The collapsibility of the core is a function of the high permeability obtained in the case of Arabic gum. At baking temperature of 200°C and a baking time of 1.5 h the compression strength after baking increases as the percentage of water decreases. The results obtained showed that the binder of molasses, starch and Arabic gum could serve as effective binder of high core strength for core making processes.

Key words: Binders, foundry core, core strength.

Abbreviation

GFN, Grain fineness number; AFS, adaptive frequency sampling.