摘要
The present invention relates to a ceramic core which can be easily handled at room temperature and has excellent bending strength and dimensional stability so that the ceramic core is not easily deformed or damaged even during a casting process, said ceramic core further having excellent dissolvability in an aqueous alkaline solution; and a method for producing the ceramic core. A ceramic core is obtained by firing a mixture that contains 0.1%-15.0% by mass of alumina and 0.005%-0.1% by mass of potassium and/or sodium with the balance made up of silica and unavoidable impurities. Not less than 90% by mass of amorphous silica is contained in 100% by mass of the silica. A method for producing a ceramic core, wherein： a blended material is obtained by blending 25%-45% by volume of a binder into 55%-75% by volume of a mixture that is obtained by mixing alumina, potassium and/or sodium, and silica so as to have the above-mentioned composition; the blended material is injected into a die so as to obtain a molded body; and the molded body is degreased at 500-600 ℃ for 1-10 hours, and then fired at 1,200- 1.400 ℃ for 1-10 hours.
2013-17. Ceramic core and method for producing ceramic core Patent No.: WO 2013018393 (Al) Date of Patent: 2013-02-07 Immlors: Fukushima Hideko Assignee: Hitachi Melals Ltd. [JP] The present invention relates to a ceramic core which can be easily handled at room temperature and has excellent bending strength and dimensional stability so that the ceramic core is not easily deformed or damaged even during a casting process, said ceramic core further having excellent dissolvability in an aqueous alkaline solution; and
