FIELD: foundry. SUBSTANCE: molding sand includes sand, binder and hollow microspheres of alumosilicate in quality 1 - 30% of mass of molding sand. Content of alumina in microspheres is in range 15 - 45 mass %; thickness of their wall consists 3 -10% of particle diameter. Size of particles are in range 10 - 350 micrometers. EFFECT: possibility for making cores of low density with good strength values and without constrictions, enhanced quality of castings. 10 cl, 5 dwg, 7 tbl, 7 ex
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|---|---|---|---|
| METHOD AND COMPOSITION FOR MAKING SLEEVES AND OTHER MEMBERS OF POURING GATES AND FEEDERS FOR CASTING MOLDS | 1997 |
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