Molding material mixture, molded part for foundry purposes...

Details Molding material mixture, molded part for foundry purposes... Molding material mixture, molded part for foundry purposes...

2011-08-30

2011-08-30

Ward, Jessica L (Department: 1735)

Metal founding

Process

Shaping a forming surface

C164S349000

Reexamination Certificate

active

08006745

ABSTRACT:
A molding material mixture for foundry purposes, comprising a mold sand, a sodium hydroxide solution, an alkali-silicate binding agent, and an additive suspension. The molding material mixture contains 0.1 to 10% by weight of sodium hydroxide solution with reference to the weight of the sand, 0.1 to 5% of binding agent with a solid matter percentage of 20 to 70%, and 0.1 to 3% by weight of the additive suspension. The additive suspension comprises 30 to 70% by volume of an amorphous, spherical SiO2particles, which have a first grain size in the range of 1 to 5 micrometers, and a second grain size in the range of 0.01 to 0.05 micrometers.

REFERENCES:
patent: 5641015 (1997-06-01), Challand
patent: 7712516 (2010-05-01), Gerlach
patent: 10 2004 042 535 (2006-03-01), None
patent: 109 5719 (2001-05-01), None

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