METHOD OF PREPARING MIXTURE FOR MAKING MOLDS AND CORES WITH GYPSUM BINDER AT MAKING CASTINGS OF NON- FERROUS AND PRECIOUS ALLOYS Russian patent published in 2003 - IPC

Abstract RU 2212975 C1

FIELD: foundry, possibly manufacture of casting molds and cores with gypsum binder. SUBSTANCE: method comprises steps of subjecting filler (quartz sand) to dispersing and simultaneously cladding it with curing inhibitor (aqueous solution of sodium dihydrophosphate); realizing such process in ultrasonic field with intensity (4-9)•10⁴ Bт/m²; agitating treated filler, gypsum, dust like sublimate of fireclay production and adding distilled water as mixing agent; agitating prepared suspension and performing its vibration-vacuum treatment. In prepared mixture curing inhibitor is uniformly dispersed in mixture volume; filler is maximally dispersed. EFFECT: improved physical and mechanical properties of casting molds and cores, enhanced quality of surface of castings used in machine engineering and in decorative art. 3 tbl, 2 ex

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RU 2 212 975 C1

Authors

Znamenskij L.G.

Dates

2003-09-27—Published

2002-09-30—Filed