Patent ID: 7347905
Filing Date: 2008-03-25
Classification: C22C

Abstract:
1. An aluminum silicon lost foam cast alloy consisting essentially of: 9.0-9.5% by weight silicon, 0.05-0.300% by weight strontium, 0.20% by weight maximum iron, 0.05-0.25% by weight copper, 0.05-0.50% by weight manganese, 0.05-0.60% by weight magnesium, 3.0% by weight maximum zinc, and the balance aluminum, wherein the alloy is cast with a lost foam casting process that applies approximately 10 ATM of pressure during solidification of the alloy to substantially completely suppress the formation of hydrogen porosity and substantially decrease the incidence of porosity defects and narrow the solidification range in comparison to conventional lost foam cast aluminum silicon alloys.