High ratio silicate foundry sand binders

Details High ratio silicate foundry sand binders High ratio silicate foundry sand binders

1980-10-16

1982-02-23

Hayes, Lorenzo B.

Compositions: coating or plastic

Coating or plastic compositions

Molds and mold coating compositions

106 385R, 106 388, 106 81, 106 83, 106197C, 260 17R, 260 285AS, 260 296S, 260 4213, B28B 734

Patent

active

043167446

ABSTRACT:
Binder solution for preparing sand cores of initial high strength but with essentially no strength after casting metals above 700.degree. C., said binder solution comprising an aqueous solution of sodium, potassium or lithium silicate having an overall molar ratio of SiO.sub.2 /alkali metal oxide from 3.5:1 to 10:1, and containing sufficient amorphous silica so that the fraction of the total silica in the binder solution which is present as amorphous silica is from 2 to 75%, the amorphous silica having a particle size in the range from about 2 nanometers to 500 nanometers.

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patent: 3625722 (1971-12-01), von Freyhold
patent: 3642503 (1972-02-01), Beaney
patent: 3712941 (1973-01-01), Myers
patent: 3715224 (1973-02-01), Campbell
patent: 3752680 (1973-08-01), Moore
patent: 3852085 (1974-12-01), Vurlicer
patent: 3920578 (1975-11-01), Yates

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