| abstract |
The foundry core (1) of the present invention has a vitreous aggregate (2) mainly composed of silica, and a sodium chloride-containing inorganic binder (3) for connecting the aggregates (2) to each other. The casting core (1) can be produced by preparing a polar solvent (5), a vitreous aggregate (2) containing silica as a main component, and an inorganic binder (3) containing sodium chloride ), the kneaded product (5) is poured into a molding die, and the kneaded product (5) is dried and molded in the molding die. According to this casting core, it is possible to achieve both the securing of strength during casting and the easy collapsibility after casting. |