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Traditional organic binders used by the foundry industry produce problems such as VOCs, smoke and etc. A water glass binder system has been developed to improve the casting strength and to solve the environmental problems. However the water glass binder has a serious problem of sand burning. In this study, a water glass binder was developed to improve sand burning during aluminium casting. The water glass inorganic binder was prepared using a gas-forming additive of calcium carbonate, activated carbon and mono saccharide. The water glass binder was characterized by XRF, viscosity and TGA-DTA. We then evaluated the water glass binder core strength. Casting tests were conducted using Al-Si7Mg alloy to compare the ability to inhibit sand burning in a sand mold. The XRF results of the prepared water glass binder showed a similar molar ratio of SiO2/Na2O. As a result of the TGA-DTA analysis and gas emission calculation, it was confirmed that the water glass binder using monosaccharide produced the most gas at 500-600C. Casting evaluation showed improved sand burning for the water glass binder with mono saccharide. Also, core strength was found to be similar to the commercial water glass binder. These results prove that the water glass binder using mono saccharide could replace the traditional organic binder. (Received July 27, 2017; Accepted Junuary 16, 2018)

Effect of Additives on the Sand Burning of Inorganic Binder in Al-Si7Mg Alloy Casting