| abstract |
(57) [Abstract] [Purpose] No gas is generated during pouring, casting defects such as blowholes can be prevented, cast steel products can be made thinner, and physical properties of cast steel can be prevented from deteriorating. (EN) Provided are a manufacturing method and a binder which can obtain precision, can be used for casting from light alloys to cast steel products, and can adjust the strength of the inner core portion and improve disintegration. [Structure] (a) A step of molding a molded article body with an aggregate and a first binder; (b) Group 4A or 4B of the periodic table. Group (excluding carbon) and 3A or 3B group metal alkoxides and one or more kinds of metal alkoxides selected from partial hydrolysates thereof, and an alkali compound of alkali metal or alkaline earth metal (metal alkoxide) , A metal hydroxide and a salt thereof, or a mixture of two or more of them) is used to impregnate the molded article body molded in the step (a) with a second binder and to add water. A step of decomposing; (c) a step of drying the molded article body and firing it at a high temperature. |