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US 4,541,867 AGranted
Varnish-bonded carbon-coated magnesium and aluminum granules
AssigneeAmax Inc.
InventorsRamaswami Neelameggham, Hedayat Abedi, John C. Priscu, Michael H. Legge
Life of this patent
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Abstract
Varnish-bonded, carbon-coated metal granules are provided, the metal granules being preferably selected from the group consisting of magnesium, aluminum and alloys thereof. The coating may optionally contain at least one calcium compound, e.g., at least one calcium compound selected from the group consisting of CaO, CaCO.sub.3, CaC.sub.2, CaSiO.sub.3, CaSi.sub.2, CaAl.sub.2 O.sub.4, portland cement and CaF.sub.2.
Claims9
An addition agent for treating molten metals comprising,
- coated granules of a metal selected from the group consisting of magnesium, aluminum and alloys thereof of size ranging from of about 30 to 150 mesh (U.S. Standard),
- said coating characterized by a varnish-bonded, carbon-containing layer produced from a polymerizable oil thermally polymerized to a varnish and then partially carbonized by thermal decomposition,
- said coated granules being further characterized by being free flowing, substantially non-hygroscopic and exhibiting reduced pyrophoricity.
An addition agent for treating molten metals comprising,
- coated granules of a metal selected from the group consisting of magnesium, aluminum and alloys thereof,
- said coating characterized by a varnish-bonded, carbon-containing layer produced from a polymerizable oil thermally polymerized to a varnish and then partially carbonized by thermal decomposition, said coating containing a dispersion of fine particles of at least one calcium compound,
- said coated granules being further characterized by being free flowing, substantially non-hygroscopic and exhibiting reduced pyrophoricity.
Dependencies are inferred from the claim text.