| 摘要 |
PURPOSE:To prevent temp. drop of molten metal and to improve fluidity of the molten metal by coating surface of a core for pressure casting by the specific material having heat insulation. CONSTITUTION:Sand core body 2 is molded by using silica sand, zircon sand, etc., as an aggregate in the core 2 and phenol resin as an organic binder. Next, the material 3 having heat insulation, dispersing or dissolving poly metallocarbosilane and inorganic filler in an organic solvent, is applied on the surface of the sand core 2 by using a bar coater and baked. By this method, even if the core has complicated shape of under-cut shape or hollow shape, it can be effectively formed.
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