Core for use in casting

摘要

A salt core (2) is formed by casting a mixed material of a salt material and a ceramic material. Any one of a chloride, bromide, carbonate, and sulfate of potassium or sodium is used as the salt material. As the ceramic material, artificially synthesited cohislievs of any one of aluminium borate, silicon nitride, silicon carbide, potassium hexatitanate, potassium octatitanate and zinc oxide is used.