MIXTURE FOR MANUFACTURING MOLDS AND RODS ON GYPSUM BINDER IN PRODUCTION OF NONFERROUS AND PRECIOUS ALLOY CASTINGS Russian patent published in 2001 - IPC

Abstract RU 2175902 C1

FIELD: foundry. SUBSTANCE: mixture includes following ingredients, wt. %: gypsum, 10-14; dispersed quartz sand with fineness 50-160 mcm, 50-63; dust-like chamotte production sublimate, 3.7-7.0; sodium dihydrophosphate, 0.05-0.1; and water, the balance. Introduction of sodium dihydrophosphate provides increase in adhesion capability and that of dispersed quartz sand decrease of coefficient of thermal linear expansion of mixture. EFFECT: improved preciseness, strength, and fissure-resistance of molds and rods. 2 tbl

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RU 2 175 902 C1

Authors

Erdakov I.N.

Znamenskij L.G.

Kulakov B.A.

Dubrovin V.K.

Zorin S.A.

Bober V.I.

Dates

2001-11-20—Published

2000-10-05—Filed