Method of making silica sand molds and cores for metal founding

Details Method of making silica sand molds and cores for metal founding Method of making silica sand molds and cores for metal founding

1996-09-20

1999-06-15

Batten, Jr., J. Reed

Metal founding

Process

Shaping a forming surface

106 382, 106 383, 106 389, 164529, B22C 102

Patent

active

059112697

ABSTRACT:
Thermal expansion defects, i.e. veining, are reduced in iron, steel, and nonferrous castings by adding a lithia-containing material in a sufficient amount to the silica sand mold to provide about 0.001% to about 2.0% of lithia. The addition of lithia is accomplished by adding lithium bearing minerals such as .alpha.-spodumene, amblygonite, montebrasite, petalite, lepidolite, zinnwaldite, eucryptite or lithium carbonate.

REFERENCES:
patent: 4131476 (1978-12-01), Melcher et al.
patent: 4735973 (1988-04-01), Brander
patent: 4897294 (1990-01-01), Libby et al.
patent: 5057155 (1991-10-01), Nakayama et al.
Spodumene, Technical Data Bulletin, 313-A, published by Foote Mineral Company.

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