Patent ID: 6132532
Filing Date: 2000-10-17
Classification: C22C

Abstract:
A process for producing an Al--Si casting alloy, comprising:heating the alloy to the pouring temperature Tp between liquidus temperature and 750.degree. C.,adding a modifier to the melt, the modifier comprising an ultra disperse powder capable of remaining in a solid state during the process for producing the Al--Si casting alloy.overheating the melt to a second temperature, said second temperature being above a branching temperature of a viscosity or density temperature dependency of said melt as obtained at heating from liquidus up to 1100.degree. C. and subsequent cooling,maintaining the melt at the second temperature for between about 20 and 30 minutes,cooling the melt down to the pouring temperature Tp between liquidus temperature and 750.degree. C.,performing at least one of the steps of degassing and fluxing the alloy, and pouring the melt.