Pure aluminum as fiat casting was poured into metal molds, and the thermal resistance at the casting-mold interface was analyzed by using finite difference methods of one-dimentional heat conduction equation. Thermal resistance decreases drastically from the initial large value until it settles down on a value, and does not seem to change noticeably until the end of freezing. Thermal resistance does not depend upon the surface temperature of mold, mold thickness, or thickness of casting in this experiment. The thermal resistance of graphite coating is comparatively small, about 10-20cm
2·sec·°C/cal, but those of alumina coating and diatomaceous earth coating were about 30-40 and about 70cm
2. sec·°C/cal respectively. Thermal resistance depends upon the fineness of molddressing materials, namely, roughness of the surface of coating. If the material of mold dressing is fine enough, the thermal resistance depends mainly upon the thickness of coating.
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