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US 4,358,422 AGranted
Low tin jewel metal alloy
AssigneeASARCO Incorporated
InventorsIan M. Shaw, William R. Stack
Life of this patent
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Abstract
A bismuth-lead alloy containing lesser amounts of tin, antimony and zinc has been developed for use as a fusible metal, and particularly as a jewel metal alloy. The alloy meets the standards set by presently available jewel metals, has a lower melting temperature, better casting properties, and is less expensive than currently used alloys.
Claims10
A jewel metal alloy having excellent casting characteristics, low liquidus and solidus temperatures and minimal gas porosity comprising:
- a bismuth-lead based alloy with a bismuth-lead ratio of about 1.3 to 1.0 having about 45.0-55.0 wt. % bismuth and about 34.5-42.5 wt. % lead;
- about 1.0 to 15.0 wt. % tin;
- about 1.5 to 5.0 wt. % antimony;
- about 0.05 to 1.00 wt. % zinc.
1 more element
A jewel metal alloy having excellent casting characteristics, low liquidus and solidus temperatures and minimal gas porosity comprising:
- a bismuth-lead composition with a bismuth-lead ratio of about 1.3 to 1.0 having about 45.0-55.0 wt. % bismuth and about 34.5-42.5 wt. % lead;
- about 4.7 to 5.2 wt. % tin;
- about 1.8 to 3.0 wt. % antimony;
- about 0.50 to 0.65 wt. % zinc.
1 more element
Dependencies are inferred from the claim text.