Refractory containing investment material and method of making

Details Refractory containing investment material and method of making Refractory containing investment material and method of making

1992-09-21

1994-05-10

Klemanski, Helene

Compositions: coating or plastic

Coating or plastic compositions

Molds and mold coating compositions

164528, 164529, B28B 734

Patent

active

053104200

ABSTRACT:
An improved refractory investment material for use in making refractory molds is provided. The material comprises an investment powder including a binder, a refractory selected from calcined mullite and pyrophyllite, additives for controlling setting and about 0.01 to about 0.04% by weight of a sulfate salt. The investment powder is formed into a slurry with a solution of a water based colloidal silica in an amount providing about 3% to about 6% by weight colloidal silica based on the weight of the water and a chloride salt in an amount of at least about 0.5% by weight based on the weight of said investment powder.

REFERENCES:
patent: 1888441 (1930-08-01), Weidemann
patent: 1924874 (1933-08-01), Moore
patent: 2216555 (1940-10-01), King
patent: 3303030 (1967-02-01), Preston
patent: 3436236 (1969-04-01), Gamber et al.
patent: 4106945 (1978-08-01), Erndt

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