Metal treatment – Process of modifying or maintaining internal physical... – With casting or solidifying from melt
Patent
1993-04-23
1994-03-01
Dean, R.
Metal treatment
Process of modifying or maintaining internal physical...
With casting or solidifying from melt
123195R, 148700, 148702, 148415, 148437, 148438, 148439, 148440, 164 34, 164 35, 420534, 420546, C22F 104
Patent
active
052903737
ABSTRACT:
A method of evaporable foam casting of metal articles, such as engine blocks for internal combustion engines. An evaporable foam pattern having a configuration proportionally identical to the article to be cast is positioned in a mold and a finely divided flowable material, such as sand, surrounds the pattern and fills the internal cavities of the pattern. A molten hypereutectic aluminum-silicon alloy containing 16% to 19.5% by weight of silicon and containing a magnesium content in excess of the magnesium solid solubility limit, is fed into the mold and into contact with the pattern. The heat of the molten metal vaporizes the pattern, with the vapor being trapped within the sand and the molten metal filling the void created by vaporization of the pattern to provide a cast article. The high magnesium content in the alloy produces in the solid state a Mg.sub.2 Si phase in the eutectic and in the molten state an insulating magnesium oxide surface film which decreases the chilling of the molten metal front and prevents the liquid styrene defects resulting from degradation of the polymeric material.
REFERENCES:
patent: 4603665 (1986-08-01), Hesterberg et al.
patent: 4821694 (1989-04-01), Hesterberg et al.
patent: 4966220 (1990-10-01), Hesterberg et al.
patent: 4969428 (1990-11-01), Donahue et al.
Cleary Terrance M.
Donahue Raymond J.
Hesterberg William G.
Brunswick Corporation
Dean R.
Koehler Robert R.
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