| 摘要 |
PROBLEM TO BE SOLVED: To obtain fine primary crystal Si without requiring special skilled work by bringing the molten metal of an Al-Si alloy mixed with P into contact with a galvanized metallic base material made of Cu in an extremely short time and converting the crystals of Al-Si and P into a cluster in accordance with the lapse of time. SOLUTION: When the molten metal of an Al-Si alloy heated at about 800 deg.C is mixed with P, and then is brought into contact with a galvanized metallic base material made of Cu, Zn and Cu are reacted with P in the molten metal to produce ZnP and CuP, and the temp. of the molten metal locally reduces to about 400 deg.C. At this temp., ZnP and CuP are stable, and Al-Si-P are temporarily decomposed, but, since the contact time between the metallic base material and the molten metal is a short time of about 5 sec, after the contact, the temp. of the molten metal again returns to about 800 deg.C, the ZnP and CuP are made unstable and are immediately decomposed, and the molten metal again forms Al-Si-P. The crystals of Al-Si-P floating in the molten metal are bonded in accordance with the passage of the time and are converted into a cluster, by which the number of the crystals as the nuclear material of the primary crystal Si reduces.
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