Die material and method of using same

Details Die material and method of using same Die material and method of using same

1984-06-04

1986-05-27

Hayes, Lorenzo B.

Compositions: coating or plastic

Coating or plastic compositions

Molds and mold coating compositions

106 389, 164528, 264 16, B28B 728

Patent

active

045913854

ABSTRACT:
A die material particularly suitable for the making of castings or the like, comprises 50 to 80 parts of magnesium oxide, 10-40 parts of alumina, 2 to 6 parts of monohydrated ammonium phosphate, and 1 to 4 parts of dihydrated ammonium phosphate. The dry blend thus formed, when mixed with a chilled liquid binder containing a collodial silica sol of about 40 weight percent solids content in the ratio of one portion of the liquid binder and from 2 to 5 portions of the dry blend, forms a ceramic slurry which can be readily set in hot water within 4 to 10 minutes. The set ceramic casting is then dry heated to about 250.degree. F. for one to two hours. Molten metal is then applied on the casting for forming a metal jacket to use in dental prostheses.

REFERENCES:
patent: 2209035 (1939-01-01), Prosen
patent: 2835618 (1958-05-01), Keller et al.
patent: 3649732 (1972-03-01), Brigham et al.
patent: 3960580 (1976-06-01), Stierli et al.

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