Inorganic foundry binder systems and their uses
AssigneeAshland Oil, Inc.
InventorsRuth A. Bambauer, Heimo J. Langer, Steven C. Akey
Life of this patent
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Abstract
This invention relates to inorganic no-bake foundry binder systems and their uses. The binder systems comprise as separate components: (A) mono-aluminum phosphate in an aqueous solution containing specified phosphoric acids, and (B) magnesium oxide; and certain specified zinc compounds in either the Component A, Component B or both. The components of the binder system react when they are mixed with a foundry aggregate to prepare foundry mixes which are used to prepare foundry molds and cores. The foundry molds and cores are used to cast metals.
Claims16
An inorganic foundry binder system which comprises as separate components:
- A. an acid phosphate in an aqueous acid solution of a phosphoric acid selected from the group consisting of orthophosphoric acid, pyrophosphoric acid, trimetaphosphoric acid, tetrametaphosphoric acid, polyphosphoric acid, and mixtures thereof, and
- B. magnesium oxide;
- and
- wherein a zinc compound, which will act as a mono zinc phosphate precursor, is part of either Component A, Component B, or both, such that the amount of zinc in said binder system is from 0.5 to 25 weight percent, said weight percent being based upon the total weight of Component A and Component B, and such that the weight ratio of the Component A to Component B is from 3:1 to 1:3.
The binder system of 4 wherein the amount of mon-aluminum phosphate is from 25 to 55 weight percent based upon the total weight of Component A.
A foundry mix comprising in admixture:
- (1) a foundry aggregate;
- and
- (2) an effective amount of a foundry binder system
- A. an acid phosphate in an aqueous acid solution of a phosphoric acid selected from the group consisting of orthophosphoric acid, pyrophosphoric acid, trimetaphosphoric acid, tetrametaphosphoric acid, polyphosphoric acid, and mixtures thereof, and
- B. magnesium oxide;
- and
- wherein a zinc compound, which will act as a mono zinc phosphate precursor, is part of either Component A, Component B, or both, such that the amount of zinc in said binder system is from 0.5 to 25 weight percent, said weight percent being based upon the total weight of Component A and Component B, and such that the weight ratio of the Component A to Component B is from 3:1 to 1:3.
The foundry mix of 13 wherein the amount of mon-aluminum phosphate is from 25 to 55 weight percent based upon the total weight of Component A.
Dependencies are inferred from the claim text.