C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
75/77
C22C 18/04 (2006.01)
Patent
CA 1230993
TITLE A ZINC-ALUMINUM ALLOY SAND CASTING INVENTORS Maheswar Sahoo Laurence Vernon Whiting ABSTRACT A zinc-aluminum alloy sand casting is provided, consisting of about 7 to 31 weight % aluminum, about 0.50 to 2.50 weight % copper and about 0.010 to 0.030 magnesium, balance zinc except for impurities, which may be cast with negligible formation of the casting, underside shrinkage defects associated with, for example, known formulations of these alloys, by including in them about 0.02 to about 0.10 weight % of a casting, underside shrinkage defect retarding metal, the casting underside shrinkage defect retarding metal consisting of at least one metal selected from the group consisting of calcium and strontium. When the aluminum content is about 8.0 to 8.8 weight %, the alloy preferably contains about 0.8 to 1.3 weight % copper and about 0.015 to 0.030 weight % magnesium. When the aluminum content is about 10.5 to 11.5 weight %, the alloy preferably contains about 0.5 to to 1.25 weight % copper and about 0.015 to 0.030 weight % magne- sium. When the aluminum content is about 25 to 28 weight %, the alloy preferably contains about 2.0 to 2.5 weight % copper and about 0.01 to 0.02 weight % magnesium. When the underside shrinkage defect retarding metal is strontium it is preferably present in the range of about 0.02 to 0.06 weight % in order that less dross formation occurs, similarly, when the underside shrinkage retarding metal is calcium, it is preferably present in the range about 0.05 to 0.1 weight % for the same reason.
467007
Sahoo Maheswar
Whiting Laurence V.
Her Majesty In Right Of Canada As Represented By The Minister Of Mines And Resources Canada
Szereszewski Juliusz M.sc.
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