Patent ID: 6755238
Filing Date: 2004-06-29
Classification: B22C

Abstract:
A mixture for preparing a disintegrative casting core for high pressure casting, the mixture comprising:a) 70-95% by weight of a fusible, water-soluble salt or salts; and b) 5-30% by weight of chemically non-reactive, fine hard particles, said fine hard particles being selected from the group consisting of powders, fibers, and whiskers of metal ceramics and mixtures thereof; and wherein the mixture has a melting point in the range from 280 to 520Â° C. and a heat conductive coefficient (&kgr;) in the range from 9.8Ã—10âˆ’2 to 1.2Ã—10 W/mÂ·Â° C., and having a high heat latent heat for melting; and wherein said fusible, water-soluble salt or salts is selected from the group consisting of CuCl, PbCl2, a mixture of NaCl (82% by weight) and CuCl (18% by weight), a mixture of KNO3 (92% by weight), and KCl (8% by weight), a mixture of KCl (54% by weight) and LiCl (46% by weight), a mixture of MgCl2 (54% by weight) and NaCl (46% by weight), a mixture of CaCl2 (53% by weight) and BaCl2 (47% by weight) and a mixture of NaCl (54% by weight) and CaCl2 (46% by weight).