| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing an aluminum-silicon alloy capable of stably mass-producing an aluminum-silicon system material having fixed characteristics so that coefficient of thermal conductivity neither changes nor deteriorates on a larger scale when the aluminum-silicon system material having Si 13 wt.% or more and 80 wt.% or less is produced by the die-casting method. SOLUTION: By preventing the generation of so called leach or a leached part from occurring on a mold, a pouring gate sleeve or a chip at the time of casting, since the casting temperature is so high as 80 deg.C or more, as the material maintains a high Si content, using a membrane material or a composite material whose surface layer is a heat-resistant material which hardly elutes a transition metal element on the surface of a place where a high temperature molten metal passes, a continuous forming with 10,000 shots or more at the casting temperature of 1,200 deg.C even when such a high Si composition as Al-50Si is involved, is performed and mixing of the transition metal element such as Fe into the inside of a product as impurities is limited to 0.3 wt.% or less and the deterioration of thermal conductivity can be restrained to a minimum.
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