SAND FOR MAKING MOLDS AND CORES WITH GYPSUM BINDER AT PRODUCING CASTINGS OF NON- FERROUS AND PRECIOUS ALLOYS Russian patent published in 2001 - IPC

Abstract RU 2163854 C1

FIELD: foundry. SUBSTANCE: molding sand includes (mass%): gypsum 12-15; Dinas powder 24-30; production waste of optical glasses 24-30; concentrate of aluminum - boron phosphate 0.02-0.04, oxalic acid 0.03-0.08; water - the balance. Usage of production waste of optical glasses due to compensation of expansion of Dinas powder at heating provides reduced thermic expansion coefficient of molds and cores. EFFECT: enhanced accuracy and strength of molds and cores, improved surface quality of jewelry and decorative fine-relief castings. 3 tbl, 1 ex

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RU 2 163 854 C1

Authors

Ivochkina O.V.

Znamenskij L.G.

Dubrovin V.K.

Kulakov B.A.

Dates

2001-03-10—Published

2000-07-12—Filed