溶融マグネシウム中SiC粒子分散挙動に及ぼす合金元素の影響

抄録

The effect of alloying elements on SiC particulate dispersion into molten magnesium was investigated. The incorporation time is defined as the time required for dispersion of solid particles into molten metal.
The incorporation time of SiC particles into molten pure magnesium was remarkably shorter and the particulate dispersion was more uniform than that of pure aluminum which was reported previously. The reason for this is the good wettability of SiC to molten magnesium, because of the low surface tension of molten magnesium. Moreover, through the reaction of Mg₂Si formation from magnesium and SiC, the wettability is improved. The incorporation time was not influenced by the addition of Ce, Mn, Zr, Bi. Pb, Sn or Zn and was prolonged by the addition of Al, Cu or Si. By alloying with Ca, the incorporation time was also prolonged, and agglomerates of a large number of SiC particles were formed.