Casting sand cores and expansion control methods therefor

Details Casting sand cores and expansion control methods therefor Casting sand cores and expansion control methods therefor

2005-12-06

2005-12-06

Wyrozebski, Katarzyna (Department: 1714)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

C524S431000, C524S430000

Reexamination Certificate

active

06972302

ABSTRACT:
Thermal expansion of sand cores and the formation of vein defects during metal casting operations can be substantially eliminated, with substantially reduced costs, by using an anti-veining material comprising less than about 4% by weight of a lithia-containing material, and at least about 1% by weight of ferric oxide (Fe2O3), said anti-veining material preferably comprising 2.5% Li2O, 10–25% of TiO2, 15–25% Al2O3, 10–25% of Fe3O4, and 60–70% of SiO2mixed with about 1% by weight of Fe2O3, preferably red iron oxide.

REFERENCES:
patent: 4735973 (1988-04-01), Brander
patent: 5911269 (1999-06-01), Brander et al.

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