COPPER ALLOY AND SEMISOLID CASTING METHOD FOR PRODUCING THE COPPER ALLOY

摘要

PROBLEM TO BE SOLVED: To obtain a copper alloy having excellent workability, and, even when molded into a complicated shape, maintaining satisfactory mechanical properties, and free from the generation of burrs at the time of the molding.;SOLUTION: An alloy melt 8 obtained by adding one or more kinds of alloy elements to copper under the conditions where crystals first coming out from a liquid phase is made into an α phase as the primary solid solution of copper, and also, the difference between the liquidus temperature and the solidus temperature in the case pressure is fixedly made to be one pressure reaches ≥45°C is made to flow down onto a tilted cooling board 2, and the grains of an α phase are produced and liberated on the tilted cooling board 2 to obtain slurry 10 in a solid-liquid coexistent state. The slurry 10 is held to a temperature range within the solid-liquid coexistent region in a mold 3 to granulate the α phase grains. The liquid phase around the granulated α phase is rapidly solidified by a cooling water tank 4, thus a casting of a copper alloy having a metallic structure where the α phase is granulated is obtained.;COPYRIGHT: (C)2006,JPO&NCIPI